Advanced Packaging Tool, the package manager for Debian-based distributions. It is also the most used tool for installing packages in Ubuntu. Questions about using any of the apt tools should use this tag.

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258
votes
15answers
309k views

How do I resolve unmet dependencies after adding a PPA?

Occasionally, when I'm installing stuff, I get an error like the following: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the ...
190
votes
7answers
161k views

How do I fix a “Problem with MergeList” or “status file could not be parsed” error when trying to do an update?

The computer gave me this output in a window: E: Encountered a section with no Package: header E: Problem with MergeList ...
100
votes
5answers
144k views

How can I fix a 404 Error when using a PPA or updating my package lists?

PPA seems to be constantly offline. Whenever I use sudo apt-get update, this error is shown: W: Failed to fetch http://ppa.launchpad.net/ 404 Not Found How do I fix these errors?
171
votes
14answers
512k views

Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?

I get this error when trying to use apt-get: E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/) is ...
29
votes
8answers
42k views

How do I remove a malformed line from my sources.list?

I have unistalled and reinstalled the Ubuntu Software Center as per info I found in a similar thread and I got the same response about line 91 or something like that. I just tried to upload a screen ...
79
votes
10answers
108k views

How do I fix the GPG error “NO_PUBKEY”?

I added some extra repositories with the Software Sources program. But when I reload the package database, I get an error like the following: GPG error [...] NO_PUBKEY [...] I know I can fix ...
95
votes
6answers
60k views

What is the easiest way to resolve apt-get BADSIG GPG errors?

I frequently cross this issue, and always have to google for an answer. Does anyone have a permanent fix for BADSIG errors from apt-get? W: GPG error: http://download.virtualbox.org lucid ...
103
votes
10answers
65k views

Trouble downloading packages list due to a “Hash sum mismatch” error

When I check for updates, I get a "Failed To Download Repository Information" error. This is what comes up under details: W: Failed to fetch ...
73
votes
23answers
134k views

How to fix Duplicate sources.list entry?

I keep getting this warning whenever I try to run sudo apt-get update. W: Duplicate sources.list entry http://archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages ...
19
votes
3answers
16k views

How do I fix this “E:Type '*' is not known on line * in source list …” update error?

Every once in a while I see users having issues to update due to errors like this: E:Type 'ain' is not known on line 1 in source list /etc/apt/sources.list.d/some-ppa.list' with varying types/line ...
114
votes
8answers
122k views

How can I get apt to use a mirror close to me, or choose a faster mirror?

Downloading from the main Ubuntu archive is slow even when it's not release day, how can I get apt-get to automatically use a mirror that is close to me?
377
votes
23answers
332k views

How can PPAs be removed?

I've added many PPAs using the add-apt-repository command. Is there a simple way to remove these PPAs? I've checked in /etc/apt/sources.list for the appropriate deb lines but they aren't there. This ...
9
votes
8answers
11k views

Failed to download repository information due to missing CDROM

When updating I got this error message: W:Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012)/dists/oneiric/main/binary-i386/Packages Please use apt-cdrom to make this ...
479
votes
16answers
691k views

How to list all installed packages?

I'd like to output a list of all installed packages into a text file, so that I can review it and bulk-install on another system. How to do this?
125
votes
5answers
119k views

How can I accept the Microsoft EULA agreement for ttf-mscorefonts-installer?

After a recent update, ttf-mscorefonts-installer prompted me to accept its license agreement. For some reason my terminal will not allow me to accept, or for some reason I am pressing the wrong ...
12
votes
5answers
63k views

“Unable to locate package” while trying to install packages by apt

When I try to install any package through the command line, I get an error. Can anyone help me on this? $ sudo apt-get install <package> Reading package lists... Done Building dependency tree ...
11
votes
6answers
31k views

Permission denied, are you root?

I get this error whenever I try to install programs using the terminal: home@ubuntu:~$ apt-get install myunity E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied) E: Unable ...
29
votes
9answers
98k views

'apt-get' does not work with Proxy

For the command sudo apt-get update I get following error: W: Failed to fetch http://ch.archive.ubuntu.com/ubuntu/dists/maverick-updates/multiverse/binary-i386/Packages.gz 407 Proxy ...
49
votes
4answers
127k views

Unable to correct problems, you have held broken packages

After upgrading from 10.04 to 12.04 I am trying to install different packages. For instance ia32-libs and skype (4.0). When trying to install these, I am getting the 'Unable to correct problems, you ...
33
votes
2answers
86k views

What does Package <package> has no installation candidate mean?

What does the above Error mean? What is an installation candidate? I was trying to do sudo apt-get install munin-memcached and I get this message: Reading package lists... Done Building ...
125
votes
4answers
99k views

What is “dist-upgrade” and why does it upgrade more than “upgrade”?

I was wondering why upgrade sometimes doesn't want to upgrade certain parts of the system, while dist-upgrade does. Here's an example after running update: apt-get upgrade: ...
3
votes
0answers
2k views

How do I fix “malformed line” errors in sources.list? [duplicate]

Possible Duplicate: How do I remove a malformed line from my sources.list? I had problems with my movie player. The sound was fine but the picture seemed to hesitate or stick or pause ...
8
votes
4answers
4k views

Can't install libglew-dev because libcheese and libclutter don't have the required versions

I'm getting the following error message when attempting to install libglew-dev, Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not ...
29
votes
10answers
44k views

Unable to install Skype on 64bit Ubuntu

I am receiving the following message while I am trying to install Skype: nidhin@ubuntu:~$ sudo apt-get update nidhin@ubuntu:~$ sudo apt-get install skype Reading package lists... Done Building ...
36
votes
2answers
17k views

create a .deb Package from scripts or binaries

I searched for a simple way to create .deb Packages for things which have no source code to compile (configs, shellscripts, proprietary software). This was quite a problem because most of the package ...
154
votes
9answers
374k views

What does “sudo apt-get update” do?

I am wondering what sudo apt-get update does? What does it update?
11
votes
2answers
32k views

Getting “'file' is different from the same file on the system” when I attempt to update through synaptic

Encountered an error while updating through Synaptic Manager. Subsequent updates gave the error at the bottom of the output. I'm a noob so any help is appreciated. al@al:~$ sudo apt-get -f upgrade ...
10
votes
4answers
4k views

Update Manager Error - Authentication Error

When I run Update Manager I get this error: This is what the error box says: W: A error occurred during the signature verification. The repository is not updated and the previous index files ...
-3
votes
0answers
334 views

Unable to locate package [duplicate]

There are many questions about Unable to locate package. For example : if user try to install package by using apt-get then the following error shown. (Here package is used only as example for ...
40
votes
6answers
47k views

My /boot partition hit 100% and now I can't upgrade. Can't remove old kernels to make room

My first issue was when i tried to apt-get update/upgrade. On upgrade I get the following error: You might want to run 'apt-get -f install' to correct these. The following packages have unmet ...
14
votes
3answers
104k views

how to install packages with apt-get on a system connected via proxy?

I've got an Ubuntu 11.10 system connected via a proxy to the internet, and I would like to install packages via apt-get. When I try to do that I get this error message: sudo apt-get install ...
25
votes
9answers
119k views

apt-get update fails to fetch files, “Temporary failure resolving …” error

Err http://archive.canonical.com natty InRelease Err http://security.ubuntu.com oneiric-security InRelease Err http://extras.ubuntu.com natty InRelease ...
36
votes
6answers
41k views

Not enough free disk space when upgrading

I'm getting an error in software updater when I try and do my daily updates. it says: The upgrade needs a total of 25.3 M free space on disk /boot. Please free at least an additional 25.3 M of ...
61
votes
6answers
85k views

How do you select the fastest mirror from the command line?

I want to update my sources.list file with the fastest server from the command line in a fresh Ubuntu Server install. I know this is trivially easy with the GUI, but there doesn't seem to be a simple ...
26
votes
5answers
6k views

the size of apt-get update lists is too big

This question contains circumventions for an bug in Ubuntu: Bug #1001780 “apt-get update size is too big” : Bugs : Launchpad itself, as well as some general advice on saving bandwidth when doing ...
31
votes
4answers
22k views

How to set up an APT repository?

I would like to set up an APT repository on a server that will provide a couple of packages. Is there a way to set one up without installing any software on the server? How do the files have to be ...
1
vote
4answers
11k views

Why do I get an “unmet dependencies” error when trying to install WINE? [duplicate]

When trying to install WINE (sudo apt-get install wine) I get the following error: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are ...
134
votes
1answer
207k views

Installed Teamviewer using a 64-bits system, but I get a dependency error

I was trying to install Teamviewer, but I was getting a dependency error. I tried to install them, but with no luck. I'm getting this error: Unpacking teamviewer (from teamviewer_linux_x64.deb) ... ...
10
votes
2answers
14k views

“The package lists or status file could not be parsed or opened”

Everytime I sudo apt-get update it always not complete and will say in the end E: Read error - read (5: Input/output error) E: The package lists or status file could not be parsed or opened. Same ...
4
votes
7answers
9k views

Got NODATA issue: 'NODATA' (does the network require authentication?)

Recently, I have ubuntu 14.04 desktop installed on my laptop, I can use my mobile broadband to access Internet with Firefox but when I want to install any package from terminal or make 'apt-get ...
87
votes
5answers
108k views

How to Downgrade a Package via apt-get?

How to downgrade a package to an older version via apt-get?! Another tools are also accepted but apt-get is preferred.
20
votes
9answers
33k views

Dropbox install stuck at 99%, how do I fix it? (and any dpkg errors)

I tried to install Dropbox using How to install Dropbox?, or with apt-get install nautilus-dropbox. Dropbox loads until 99% and then hangs, causing the system to go to 100% cpu usage. If I reboot or ...
13
votes
4answers
38k views

Can't find boot-repair package for the newest version of Ubuntu

After upgrading Ubuntu 13.10 to 14.04, grub failed to load Ubuntu and threw the error symbol 'grub_term_highlight_color' not found. I followed the solution offered in the Bug Report but this failed ...
254
votes
11answers
195k views

“The following packages have been kept back:” Why and how do I solve it?

I just added a PPA repository for the development version of the GIMP, but I get this error The following packages have been kept back: gimp gimp-data libgegl-0.0-0 libgimp2.0 Why and how can I ...
12
votes
1answer
23k views

Ubuntu not booting: “Could not write bytes: broken pipes”

The problem When I boot Ubuntu 11.10, the boot process hangs, before even getting to the login screen of the display manager, with the message Could not write bytes: broken pipes at the top of the ...
49
votes
4answers
13k views

apt-get update only for a specific repository

When I add a ppa and I want to install some of its content is quite annoying to re-update all my apt list using apt-get update Is it instead possible to only sync the content of a given repository?
13
votes
1answer
8k views

How to solve “Extra junk at end of file” when using apt?

I'm trying to configure some proxies for a guest virtual machine and now I'm getting: sudo apt-get update E: Syntax error /etc/apt/apt.conf.d/95proxy:4: Extra junk at end of file The content of the ...
69
votes
4answers
55k views

How do I get and modify the source code of packages installed through apt-get?

I am assuming that all application installed through apt-get are open source; but for those that are available in that manner, where can I get the source code for these applications as well as update ...
42
votes
3answers
28k views

How can I restore configuration files?

I would like to restore LightDM to its default state, because for some reason /etc/lightdm/unity-greeter.conf is now an empty file. Deleting /etc/lightdm/unity-greeter.conf and then running sudo ...
18
votes
10answers
77k views

407 Proxy Authentication Required

When I try to install a software using Ubuntu Software center I get: Failed to download repository information Check Your Internet connection When I try to do a apt-get install something, I get: ...