Try:

    sudo apt-get install maven

If it works for you ignore the rest of this post.

## Intro
I started setting up my Ubuntu 12.10 on April 2013 and the normal  `sudo apt-get install maven` was not working for maven 3 back then. 

The **manual installation** in this post is useful if you like to dig in deeper to your ubuntu kernel in regards with apt-get and where it finds the list of applications that are available for installation on Ubuntu
. It can also be potentially useful for more recent releases of Ubuntu like **Ubuntu 15.04**, etc. if you face the same problem as I did back then with Ubuntu 12.10. 
 
## Automatic Installation via apt-get:
Checkout the **manual installation** if your current ubuntu can not install maven via common &#39;apt-get install maven&#39;.
    
    sudo apt-get update
    sudo apt-get install maven

Make sure to remove maven 2 if your ubuntu is not fresh or if you were using maven 2 before:

    sudo apt-get remove maven2


##Manual Installation via apt-get by adding maven 3 repository (Ubuntu 14.04 check out update 1):
This can be useful if your ubuntu apt-get repositories list is not up to date.
   
Maven 3 was required to set up the system and as it turns out most of the documents out there are referring to how to install Maven to Ubuntu version 12.04 or before. Best document I found was:

[killertilapia&#39;s blog][1]

The whole process I came up with is as follows:

1. `sudo -H gedit /etc/apt/sources.list`
2. Add the following line the `sources.list` file:

 &gt; deb http://ppa.launchpad.net/natecarlson/maven3/ubuntu precise main 

 &gt;deb-src http://ppa.launchpad.net/natecarlson/maven3/ubuntu precise main

3. `sudo apt-get update &amp;&amp; sudo apt-get install maven3`
4. `sudo ln -s /usr/share/maven3/bin/mvn /usr/bin/mvn`

&gt; Caution 1: command &quot;sudo apt-add-repository ppa:natecarlson/maven3&quot; did not work on my  Ubuntu and had to run `sudo apt-add-repository -rm ppa:natecarlson/maven3` to get my apt-get to work again.

&gt; Caution 2: thanks to David, you need to remove your existing symbolic link to previous versions of maven before running step 4.

##OS X Installation
I decided to add OS X installation in case you use multiple environments for your dev: [See the source stackoverflow thread for more details][2].

Install [Homebrew][3] that is the equavalent of `apt-get`, then install Maven using:

    brew install maven

## **Update 1**: **Installation for Ubunutu 14.04**

Haven&#39;t tried this myself but I am confident this should work without security warnings:

    sudo apt-get purge maven maven2 maven3
    sudo apt-add-repository ppa:andrei-pozolotin/maven3
    sudo apt-get update
    sudo apt-get install maven3

**Note**: source [here][4], many thanks and +1s to @rendybjunior, @Dominic_Bartl, and @FunThomas424242 


  [1]: http://killertilapia.blogspot.com.au/2012/10/installing-maven-3-in-ubuntu-1204.html
  [2]: https://stackoverflow.com/questions/8826881/maven-install-on-mac-os-x
  [3]: http://brew.sh/
  [4]: https://launchpad.net/~andrei-pozolotin/+archive/ubuntu/maven3


How to install Maven 3 on Ubuntu 18.04/17.04/16.10/16.04 LTS/15.10/15.04/14.10/14.04 LTS/13.10/13.04 by using apt-get?

I&#39;m working on a Ubuntu system and currently this is what I&#39;m doing:

```lang-none
if ! which command &gt; /dev/null; then
   echo -e &quot;Command not found! Install? (y/n) \c&quot;
   read
   if &quot;$REPLY&quot; = &quot;y&quot;; then
      sudo apt-get install command
   fi
fi
```

Is this what most people would do? Or is there a more elegant solution?



How can I check if a package is installed and install it if not?

Somehow I&#39;ve managed to completely bugger the install of postgresql on Ubuntu karmic.  I want to start over from scratch, but when I &quot;purge&quot; the package with apt-get it still leaves traces behind such that the reinstall configuration doesn&#39;t run properly.

After I&#39;ve done:

    apt-get purge postgresql
    apt-get install postgresql

It said

    Setting up postgresql-8.4 (8.4.3-0ubuntu9.10.1) ...
    Configuring already existing cluster (configuration: /etc/postgresql/8.4/main, data: /var/lib/postgresql/8.4/main, owner: 108:112)
    Error: move_conffile: required configuration file     /var/lib/postgresql/8.4/main/postgresql.conf does not exist
    Error: could not create default cluster. Please create it manually with

      pg_createcluster 8.4 main --start

    or a similar command (see &#39;man pg_createcluster&#39;).
    update-alternatives: using /usr/share/postgresql/8.4/man/man1/postmaster.1.gz to provide /usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode.

    Setting up postgresql (8.4.3-0ubuntu9.10.1) ...


I have a &quot;/etc/postgresql&quot; with nothing in it and &quot;/etc/postgresql-common/&quot; has a &#39;pg_upgradecluser.d&#39; directory and root.crt and user_clusters files.

The /etc/passwd has a postgres user; the purge script doesn&#39;t appear to touch it.  There&#39;s been a bunch of symptoms which I work through only to expose the next. 

Right this second, when I run that command &quot;pg_createcluster...&quot; it complains that &#39;/var/lib/postgresql/8.4/main/postgresql.conf does not exist&#39;, so I&#39;ll go find one of those but I&#39;m sure that won&#39;t be the end of it.

Is there not some easy one-liner (or two) which will burn it completely and let me start over?


How to thoroughly purge and reinstall postgresql on ubuntu?

I&#39;m thinking to install *hylafax+* version 5.5.4 which was release last month on my [Debian][1] PC.

I checked `dpkg -l | grep &quot;hylafax&quot;` and found out that the current version is 5.5.3. Then I checked `apt-cache search hylafax` and saw the packages are available, but I can&#39;t see any version number.

How can I find the version of packages available in the `apt-get`?

  [1]: http://en.wikipedia.org/wiki/Debian

How to check the version before installing a package using apt-get?

When I try to 

    apt-get install -y tzdata

the command line option for picking timezone shows up. I am trying to use this in a script to do some setup, how can I make the apt-get run without user input?

I know to reconfigure the tzdata I can do 

    echo &quot;America/New_York&quot; &gt; /etc/timezone
    dpkg-reconfigure -f noninteractive tzdata

But when installing I need it to run fully even if it doesn&#39;t set the right timezone, I can always reconfigure it. 

I tried 

    echo 5 | apt-get install -y tzdata

but it is not working as expected.

apt-get install tzdata noninteractive

Previously, to install docker I would use

    apt-get install docker.io

However, I have recently noticed the documentation for installing docker, and it uses docker-ce. I have tried to find the difference between the two, but have come up empty. What is docker.io in relation to docker-ce?

What is docker.io in relation to docker-ce and docker-ee (now called &quot;Mirantis Kubernetes Engine&quot;)?

Is there any `apt-get`-like program for use with Cygwin?

I already tried `cyg-apt` but when I try I get this error:

    cyg-apt: downloading: http://cygwin.mirrors.pair.com/setup-2.bz2
    cyg-apt: downloading: http://cygwin.mirrors.pair.com/setup-2.ini
    cyg-apt: bad URL http://cygwin.mirrors.pair.com/setup-2.ini, exiting.

apt-get for Cygwin?

For my [Ubuntu][1] machine, I downloaded the latest version of Android SDK from [this][2] page.

After extracting the downloaded [`.tgz` file](http://dl.google.com/android/android-sdk_r24.4.1-linux.tgz), I was trying to search for [installation instructions][3] and found:

&gt;**To get started on Linux:**
&gt;
&gt;Unpack the .zip file you&#39;ve downloaded. The SDK files are download separately to a user-specified directory.
&gt;
&gt;Make a note of the name and location of the SDK directory on your system—you will need to refer to the SDK directory later when using the SDK tools from the command line.

What *exactly* are we supposed to do?

  [1]: http://www.ubuntu.com/
  [2]: http://developer.android.com/sdk/index.html#Requirements
  [3]: http://developer.android.com/sdk/installing/index.html?pkg=tools

How to install Android SDK on Ubuntu?

I have a computer without a [NIC][1], and I want to install some programs in it via USB memory, but how can I download a program from [apt-get][2] without installing it?

  [1]: http://en.wikipedia.org/wiki/Network_interface_controller
  [2]: http://en.wikipedia.org/wiki/Advanced_Packaging_Tool


How do I download a package from apt-get without installing it?

I am using Ubuntu 16.10 and recently installed Docker (v1.12.4) using the Xenial build by following the instructions found [here][1]. I haven&#39;t encountered any problems creating containers, ensuring they restart automatically, etc.

However, now every time I run **apt-get update** I receive the following error message:

    W: The repository &#39;https://apt.dockerproject.org/repo ubuntu-xenial Release&#39; does not have a Release file.
    N: Data from such a repository can&#39;t be authenticated and is therefore potentially dangerous to use.
    N: See apt-secure(8) manpage for repository creation and user configuration details.
    E: Failed to fetch https://apt.dockerproject.org/repo/dists/ubuntu-xenial/main/binary-amd64/Packages
    E: Some index files failed to download. They have been ignored, or old ones used instead.

I have tried to remedy the problem by following the advice found [here][2] and cannot seem to solve this problem.

Has anyone encountered this before and fixed it? If so, what is needed to resolve this?


  [1]: https://docs.docker.com/engine/installation/linux/ubuntulinux/
  [2]: https://github.com/docker/docker/issues/22599

Docker Repository Does Not Have a Release File on Running apt-get update on Ubuntu

When I `apt-get update` and `apt-get upgrade` my Ubuntu system, I get the following error message regarding fetching Google Chrome updates.  This only started happening a few days ago.

&lt;!-- language: bash --&gt;

    E: Repository &#39;http://dl.google.com/linux/chrome/deb stable Release&#39; changed its &#39;Origin&#39; value from &#39;Google, Inc.&#39; to &#39;Google LLC&#39;
    N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.

The error message clearly shows that this has to do with [Google changing its name][1] from *Google, Inc* to Google *LLC*.  The error message shows what&#39;s wrong, but does not tell us what command to run to fix this problem.

How can I accept this change explicitly as the message says?

[1]: https://techcrunch.com/2017/09/04/google-parent-alphabet-forms-holding-company-xxvi-to-complete-2015-corporate-reorganization/

E: Repository &#39;http://dl.google.com/linux/chrome/deb stable Release&#39; changed its &#39;Origin&#39; value from &#39;Google, Inc.&#39; to &#39;Google LLC&#39;

I&#39;ve been trying to run Docker build on various files which previously worked before, which are now no longer working.

As soon as the Docker file included any line that was to install software it would fail with a message saying that the package was not found.

    RUN apt-get -y install supervisor nodejs npm

The common message which showed up in the logs was 

    Could not resolve &#39;archive.ubuntu.com&#39;

Any idea why any software will not install?

Docker build &quot;Could not resolve &#39;archive.ubuntu.com&#39;&quot; apt-get fails to install anything

When I try to install npm with `sudo apt-get install npm`, I got following error:

&gt; E: Unable to locate package npm

Why can&#39;t apt find npm? I&#39;m using Debian 9 and already did run 

    sudo apt-get install nodejs

E: Unable to locate package npm

I&#39;ve installed node.js in my machine (linux mint 15), when I run `node example.js`, it says:

    The program &#39;node&#39; can be found in the following packages:
     * node
     * nodejs-legacy
    Try: sudo apt-get install &lt;selected package&gt;

So what are the differences between node and nodejs? I had both node.js and node installed previously, but when I run `node example.js`, the web server doesn&#39;t start at all. So I deleted node and kept node.js.   

What are the differences between node.js and node?

Since i installed certbot on Debian 10, it always shows this error:
```
root@HypeTime:/home/sinusbot# apt update
Hit:1 http://security.debian.org/debian-security buster/updates InRelease
Hit:2 http://deb.debian.org/debian buster InRelease
Hit:3 http://deb.debian.org/debian buster-updates InRelease
Ign:4 http://ppa.launchpad.net/certbot/certbot/ubuntu focal InRelease
Err:5 http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release
  404  Not Found [IP: 2001:67c:1560:8008::15 80]
Reading package lists... Done
E: The repository &#39;http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release&#39; does not have a Release file.
N: Updating from such a repository can&#39;t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
```
Does someone know how to fix this error?

E: The repository &#39;http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release&#39; does not have a Release file

Is it possible to somehow answer the questions that are presented as dialogs when installing some packages using apt-get?

For instance I&#39;m trying to setup a container containing the `mail-stack-delivery` package with:

    FROM ubuntu

    RUN apt-get install -y mail-stack-delivery

However that dockerfile generates dozens of errors when built that are along the lines of:

    debconf: unable to initialize frontend: Dialog
    debconf: (TERM is not set, so the dialog frontend is not usable.)
    debconf: falling back to frontend: Readline
    debconf: unable to initialize frontend: Readline
    debconf: (Can&#39;t locate Term/ReadLine.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl .) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7, &lt;&gt; line 11.)
    debconf: falling back to frontend: Teletype
    dpkg-preconfigure: unable to re-open stdin: 

From what I understand I just simply can&#39;t respond to the dialogs, but is there some way that I can pass a parameter to answer each question in advance? I know that it&#39;s just changing some configurations, so I could do it after the fact, but presumably it&#39;s better to let the install scripts do it so everything gets set properly.

Is it possible to answer dialog questions when installing under docker?

I&#39;m trying to install a package on a machine with no Internet connection. What I want to do is download all the packages and dependences on a machine WITH an Internet connection and then sneaker-net everything to the offline computer.

I&#39;ve been playing with the `apt-get` and `apt-cache` but I haven&#39;t figured out a quick and easy way to download the package and dependencies in one swoop to a directory of my choosing. How would I do this? Am I going about this problem correctly?
How would you install offline packages that have a lot of dependencies?

 

How to download all dependencies and packages to directory

Installing Oracle Java 7 in Debian via  apt-get repository doesn&#39;t seems to work. 

    apt-get install oracle-java7-installer

Look like `apt-get` does not recognize `oracle-java7-installer`.

Installing Java 7 (Oracle) in Debian via apt-get

I have installed OpenCV using the instructions in https://help.ubuntu.com/community/OpenCV

    $ sudo su
    $ sudo apt-get install build-essential
    $ sudo apt-get install libavformat-dev
    $ sudo apt-get install ffmpeg
    $ sudo apt-get install libcv2.3 libcvaux2.3 libhighgui2.3 python-opencv opencv-doc libcv-dev libcvaux-dev libhighgui-dev

now when i execute &quot;pkg-config --cflags --libs opencv&quot; i get this error:

    Package opencv was not found in the pkg-config search path.
    Perhaps you should add the directory containing `opencv.pc&#39;
    to the PKG_CONFIG_PATH environment variable
    No package &#39;opencv&#39; found

how can I resolve this problem?

**-------UPDATE-------**

OK, I figured out how to solve the problem...

I made a file named &quot;opencv.pc&quot; and copied it to &quot;/usr/local/lib/pkgconfig&quot;
Then i added these two lines to &quot;.bashrc&quot;:

    PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
    export PKG_CONFIG_PATH

that&#39;s it! everything is OK now.

the contents of the file are:

    prefix=/usr
    exec_prefix=${prefix}
    includedir=${prefix}/include
    libdir=${exec_prefix}/lib
    
    Name: opencv
    Description: The opencv library
    Version: 2.x.x
    Cflags: -I${includedir}/opencv -I${includedir}/opencv2
    Libs: -L${libdir} -lopencv_calib3d -lopencv_imgproc -lopencv_contrib -lopencv_legacy -lopencv_core -lopencv_ml -lopencv_features2d -lopencv_objdetect -lopencv_flann -lopencv_video -lopencv_highgui

**UPDATE - 2014**



it seems that the ubuntu community has completed the documentation on installing openCV, all you have to do now is to download the installation script from https://github.com/jayrambhia/Install-OpenCV/blob/master/Ubuntu/opencv_latest.sh and execute it.

Package opencv was not found in the pkg-config search path

I want to install ruby **2.0** using

    sudo apt-get install ruby2.0

But there isn&#39;t available package for ruby2.0

I want to install it using **apt-get install** the same like ruby 1.9.1

Any suggestions?

How to install Ruby 2 on Ubuntu without RVM

Here is how the error output is if I run `virtualbox` from the terminal. How to correct it? I am on a Ubuntu 12.10 64bit machine.

    virtualbox
    WARNING: The character device /dev/vboxdrv does not exist.
    	 Please install the virtualbox-ose-dkms package and the appropriate
    	 headers, most likely linux-headers-generic.
    
    	 You will not be able to start VMs until this problem is fixed.

EDIT:

I have both the latest `linux-headers-generic` and `virtualbox-ose-dkms` packages

How to correct virtualbox installation

I was installing the Google Cloud SDK on my Ubuntu VM using the following commands

    # Add the Cloud SDK distribution URI as a package source
    echo &quot;deb [signed-by=/usr/share/keyrings/cloud.google.gpg] http://packages.cloud.google.com/apt cloud-sdk main&quot; | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
    
    # Import the Google Cloud Platform public key
    curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key --keyring /usr/share/keyrings/cloud.google.gpg add -
    
    # Update the package list and install the Cloud SDK
    sudo apt-get update &amp;&amp; sudo apt-get install google-cloud-sdk

and I think its broken now. 

     apt-get install unixODBC unixODBC-dev
    E: Conflicting values set for option Signed-By regarding source https://packages.cloud.google.com/apt/ cloud-sdk: /usr/share/keyrings/cloud.google.gpg != 
    E: The list of sources could not be read.
    E: Conflicting values set for option Signed-By regarding source https://packages.cloud.google.com/apt/ cloud-sdk: /usr/share/keyrings/cloud.google.gpg != 
    E: The list of sources could not be read.

Is there anyway to fix it so I can continue to download packages. 

Apt-get is broken after install Google Cloud SDK on Ubuntu 18.04 LTS

I just installed Jenkins on my Ubuntu server via the debian installation steps (using apt-get install).  I want my build to pull from a private git repository on GitHub.  With that, I need to use SSH access to get to my repository.

Most of my search results have just said to login as the Jenkins user and generate an SSH key for my GitHub account, but installing through the debian package manager, I don&#39;t have a password for the Jenkins user.

So how do I generate an SSH key for my Jenkins server to use?

Jenkins User on Apt-Get Install Installation

I&#39;m trying to create puppet module which automates installation of zend server CE, this is not important here, but steps are as following

 1. update /etc/apt/source.list
 2. download repos key via wget
 3. do apt-get update
 4. do apt-get install zend-server-ce-5.2

I have `init.pp` file

    class zendserverce {

	# https://github.com/puppetlabs/puppetlabs-stdlib
	file_line { &#39;debian_package&#39;:
	   	path =&gt; &#39;/etc/apt/sources.list&#39;,
	   	line =&gt; &#39;deb http://repos.zend.com/zend-server/deb server non-free&#39;
	}

	exec { &quot;wget http://repos.zend.com/zend.key -O- |apt-key add -&quot;:
	    path =&gt; [&quot;/usr/bin&quot;, &quot;/usr/sbin&quot;]
  	}
  	
  	exec { &quot;apt-get update&quot;:
		command =&gt; &quot;/usr/bin/apt-get update&quot;,
		onlyif  =&gt; &quot;/bin/sh -c &#39;[ ! -f /var/cache/apt/pkgcache.bin ] || /usr/bin/find /etc/apt/* -cnewer /var/cache/apt/pkgcache.bin | /bin/grep . &gt; /dev/null&#39;&quot;,
	}

    package { &quot;zend-server-ce-php-5.2&quot;:
        ensure =&gt; &quot;latest&quot;
   	}

    }


Seems that puppet runs commands in different order then I need. Is there any way how to for tell him to run in my desired order?

The output of such snippet is

      [0;36mnotice: /Stage[main]/Mc/Package[mc]/ensure: ensure changed &#39;purged&#39; to &#39;latest&#39;[0m
      [1;35merr: /Stage[main]/Zendserverce/Package[zend-server-ce-php-5.2]/ensure: change from purged to latest failed: Could not update: Execution of &#39;/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install zend-server-ce-php-5.2&#39; returned 100: Reading package lists...
      Building dependency tree...
      Reading state information...
      E: Couldn&#39;t find package zend-server-ce-php-5.2 at /tmp/vagrant-puppet/modules 0/zendserverce/manifests/init.pp:28[0m
      [0;36mnotice: /Stage[main]/Zendserverce/Exec[wget http://repos.zend.com/zend.key -O- |apt-key add -]/returns: executed successfully[0m
      [0;36mnotice: /Stage[main]/Zendserverce/File_line[debian_package]/ensure: created[0m
      [0;36mnotice: Finished catalog run in 6.75 seconds[0m


So it says: Couldn&#39;t find package zend-server-ce-php-5.2

Can anyone guide me what is wrong?

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