APT (Advanced Packaging Tool) is the standard software package management system for Debian and its derivatives.

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How to list files and folders that are not maintained by any DEB package

I am in the process of moving my files from one Debian machine to another so that I can use the old machine for a different purpose. I do not want to miss any file because I will be formatting the ...
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Restore /etc/ configuration files from the default

Is there a way to replace /etc configuration files from a package, overwriting my local changes? I've tried apt-get install --reinstall mypackage but it doesn't update the files. How can I do this?
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Finding an earlier version to downgrade to

On my Debian server, I upgraded the SQLite package to version 3.7.7 but discovered that it contains a critical bug that breaks several things including my Subversion repository. So, I would like to ...
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How do you fix apt-get update “Hash Sum mismatch”

I have an Ubuntu 12.04 virtual box vm that I instantiate using Vagrant. git clone https://github.com/spuder/puppet-gitlab vagrant up As soon as the vagrant box runs apt-get update, I get the ...
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unable to remount filesystem back to read-only after package upgrade

On my Debian system, I have my / on separate partition and mounted read-only. Only /home/, /var/ and /tmp/ are writable. I have also created a Pre-Invoke and Post-Invoke apt hook, so that apt can ...
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apt-get prompts for CDs when installing packages, how do I make it stop?

I used ubuntu linux before, and I installed debian OS on my labtop using DVDs that I burned. But when I'm trying to use apt-get to install software, the system always asks me to insert disk to ...
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Debian: Is it possible/safe to install packages from an older version of the repository?

I'm currently running Debian testing (Wheezy) and am trying to get SCIM working. I want to install the scim-pinyin package, but there is no such package available in the testing repository, although ...
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How to make apt-get accept new config files in an unattended install of debian from Repo

I am writing a script for a unattended install of a package that is in our repo, it is a software package with one of Debian's marked config files. Is there any option that I can pass to ...
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When and why should I use apt-get update?

General question: Could some explain what the command apt-get update does and when I really should use it? Remarks Please give a detailed answer. Not just a copy of the man page, unless your ...
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understanding the output of “apt-cache policy”

I ran apt-cache policy sudo before and after installing sudo: before install: # apt-cache policy sudo sudo: Installed: (none) Candidate: 1.8.5p2-1+nmu1 Version table: 1.8.5p2-1+nmu1 0 ...
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aptitude: Meaning of curly brackets, i.e. package1{b} package2{a} package3{u}

When using aptitude, the list of changed packages sometimes has a single character in curly brackets behind some package names. The man-page has two examples of them but does not explain them (version ...
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Output visual (ASCII) Debian dependency tree to terminal?

I'm not sure if this is more of a SuperUser or UnixLinux question, but I'll try here... Recently, I found this: #710689 - aptitude: use unicode character in the trees - Debian Bug report logs It ...
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archive.ubuntu.com missing raring-updates

My Linux Mint 15 install on VirtualBox was working great up until about two days ago, when the updater started throwing a ton of errors and refuses to progress with any apt-get update, apt-get ...
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apt-get equivalent of yum localinstall

When using Fedora I usually use yum localinstall as a way to install a rpm obtained outside the distribution repositories. I can't find an equivalent option in the apt-get man page. I'm running Ubuntu ...
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How to install some packages from “unstable” Debian on a computer running “stable” Debian?

On a computer running "stable" Debian, when trying to install a package which is in the unstable list on the Debian web site using the aptitude install <package>/unstable command, I get output ...
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Unable to install ia32-libs in Debian Wheezy

I was trying to install ia32-libs in Debian Wheezy. I got the error The following packages have unmet dependencies: ia32-libs : Depends: ia32-libs-i386 but it is not installable E: Unable to correct ...
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Every package “has no installation candidate”

While attempting to install openssh-server on Ubuntu 14.04 64-bit, I get the following error: Package openssh-server is not available but is referred to by another package. This may mean that the ...
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Re-installing apps after a fresh install?

I'm on Debian and I want to re-partition my drive and reinstall. Is there an easy way to restore all currently installed packages after a fresh installation? I'm thinking of doing it by making a ...
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Reinstalling all Debian packages

I killed by mistake a dpkg process running in the background and I would like to reinstall all packages to be sure everything is allright. First, I tried to get a list of all packages and reinstall ...
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disable apt-listchanges (and other interactive stuff) during upgrades (reliably)

I have to admit, I really really hate apt-listchanges. If I'm going to do a huge dist-upgrade, I want to just leave the computer there for a few hours. The asker of this serverfault question had a ...
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Apt-get autocompletion

I am currently running 64-bit Debian Wheezy. I am having some trouble with auto completion for apt-get. I have bash-completion installed. If I am logged in as root in a shell, I can use auto ...
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Differences in package management between Debian and Arch

A discussion from this post made me curious of differences between Debian and Arch package management. Also, people tend to say that Arch is very light-weight, so I wonder what that has to do with ...
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“ValueError: _system not initialized” when using apt.VersionCompare

I wrote a bash script that has to compare two version strings to decide to download new version or not. The test relies on a Python script that does apt.VersionCompare(), which does version comparison ...
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Force apt-get to prompt yes/no

Is there a way to force apt-get to display yes/no prompt? A --force-yes option exists, but there seems to be no --force-prompt or similar option. If you attempt to install a package that has all ...
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Debian: How to delay configuration when installing/upgrading?

One of my Debian systems is rarely upgraded. So when it is time to upgrade, there are loads of packages. Right now I basically have to monitor the upgrade, because every 50 packages or so there is a ...
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How to install/default to the command line version of Emacs?

I installed Emacs using sudo apt-get install emacs. The problem is that when I launch Emacs from the command line (e.g. emacs main.c) it opens Emacs with a GUI. I prefer the command line version which ...
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How can I completely reinstall mysql?

I had to reboot in the middle of a large data import. I only have one mysql database, which has now been corrupted. How can I completely remove mysql and reinstall it? I've tried apt-get purge ...
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How to safely resume an aptitude dist-upgrade after SSH timeout?

I started aptitude dist-upgrade over SSH on my local network. At some point the session timed out but the upgrade was not finished (it was left at one of those accept software agreement screens-- I ...
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How do I find installed packages that have no install candidate?

I'd like to retrieve a list of installed packages that have no install candidate (e.g., because I removed an apt source file entry). How would I do that on Debian-based systems?
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How do I search Debian packages by description?

I wanted to find packages related to transmission, a BitTorrent client but couldn't find how to search package descriptions. Why do this? In certain cases, package names are not obvious; for ...
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Removed apt-get from Ubuntu

Well my fingers did manage to do sudo apt-get remove libstdc++6 and write, yes. That removed alot of system files. Is there any way to bring it up working again? I have connected to terminal, and wget ...
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How can I view the list of packages that were “suggested” by apt?

When installing a package using apt-get install package a list of "Suggested packages" is displayed. What command can be used to print it again?
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What is the difference between the “jessie” and “jessie-updates” distributions in /etc/apt/sources.list?

The debian wiki page for the apt sources list gives this example file: deb http://httpredir.debian.org/debian jessie main deb-src http://httpredir.debian.org/debian jessie main deb ...
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How can I upgrade MySQL in Debian using apt-get?

I'm using the Turnkey Linux virtual machine. The version of Debian in there is apparently on the "Wheezy" upgrade path (if that's what you call it). I'm not completely comfortable with Linux, as you ...
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Download package via apt for another architecture

I am currently in a architecture amd64, so when I try apt-get download vlc, it downloaded the appropriate architecture for my system, but how can I download the i386 version via apt? It's for ...
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How to I install zabbix-agent over apt-get

Why is it that on my Ubuntu 13.04 system I can easilly install zabbix-agent by doing apt-get install zabbix-agent. When I do it in Debian 7.1, it says that the package zabbix-agent can not be found. ...
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Fix held broken packages on debian?

I want to begin exploring moving myself away from google apps, because it's expensive, and it looks like citadel has all of the groupware functions I need. So I am trying to install citadel-suite ...
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apt-get -f install is stuck on “corrupted filesystem tarfile”

I am having issues with apt-get on my Raspberry Pi. This is the output when I try and install a package: pi@raspberrypi ~ $ sudo apt-get -f install cowsay Reading package lists... Done Building ...
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How do I fix broken libxml2-dev dependency on Debian using apt?

When I run sudo apt-get upgrade on my Debian Squeeze install, I get the following error: You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: ...
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Managing unofficial repositories on a Debian system

A few years ago I added this repository to my sources.list: http://www.deb-multimedia.org/ because it contained packages like acroread or flash player, which were either missing or out of date in ...
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Block a package from being uninstalled in APT

In short, I want to be able to set package abc so that: apt-get remove abc should fail. apt-get purge abc should fail. apt-get upgrade abc should work. If the package dependencies change so that ...
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Correlating filename with package [duplicate]

Say, I'm given a filename like libasound.so.2. Is there a way to query the package manager to correlate the filename with its corresponding package? I'm interested to get answers for any package ...
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What provides /etc/exports and how do I find that out?

I have two Debian virtual machines that were built from the same netinstall iso, but probably have different packages installed. One of them has an /etc/exports file for nfs mounts but the other one ...
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apt-get doesn't stop on Ctrl-c, what to do?

Occasionally I have connection problem with apt-get (typically because I use it behind a proxy and try to install/upgrade flash). I have been trying sending Ctrlc but it would not stop. I thought it ...
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The difference between deb versus deb-src in sources.list

I don't understand the difference between these two lines in my sources.list, please explain: deb http://mirror.optus.net/debian/ testing main contrib non-free versus deb-src ...
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How to check from bash if package exists in debian

I would like to make a installation bash script, where I would like to install mysql server. On linux mint I had followed code: apt-get -y --force-yes install mysql-server-5.6 but I installed new ...
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How to reinstall apt on Debian?

I accidently removed apt-get from my Debian system by issuing: dpkg --force-depends --purge apt How can I reinstall it?
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How to install Suggests dependencies of a package

If I want to install a package and its Suggests dependencies, I run: $ sudo apt-get --install-suggests install <package name> However, if <package name> is already installed, and not ...
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How to prevent prompt that ask to restart services when installing libpq-dev

I want to install libpq-dev on my Vagrant machine. I install it with $ apt-get install -y libpq-dev During installation a prompt appears which asks if it's allowed to restart some services ...
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Get diff changes between original files installed with apt and current files

I installed php5-fpm package using apt; then I made some changes to the PHP configuration files. Now I would get the diffs between the original files versions (the ones of the package installed) and ...