Questions about the management of packages, in particular the `dpkg` system.

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194
votes
13answers
177k views

How do I resolve unmet dependencies?

How do I resolve unmet package dependencies? 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 ...
123
votes
17answers
93k views

How can I install software or packages without Internet (offline)?

I have a friend who has got a computer that is not connected to the Internet. Is there any way to install software offline easily?
17
votes
3answers
11k 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 ...
82
votes
9answers
44k views

How to prevent updating of a specific package?

Because of bug #693758 I'd like to prevent apt-get upgrade and Update Manager from updating the "libgtk2.0-0" package. How can this be achieved?
97
votes
14answers
48k views

Best way to backup all settings, list of installed packages, tweaks, etc?

If I want to make a backup of everything I have done since the fresh install of Ubuntu, what are the possible options? What all should I backup? I want to get all the settings that I changed, all the ...
280
votes
15answers
366k 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?
5
votes
8answers
7k 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 ...
22
votes
4answers
98k views

How do I enable the “Universe” repository?

How do I get to Universe Repository of Ubuntu software as mentioned in Ubuntu 12.04 LTS? I am installing 12.04 Ubuntu. Please help.
42
votes
3answers
50k views

Requires installation of untrusted packages?

I tried installing VLC Player yesterday, and I got the Requires installation of untrusted packages error. I searched for hours for a solution to this problem, and finally came upon a suggestion that ...
24
votes
2answers
18k views

How do you run a 32-bit program on a 64-bit version of Ubuntu?

I have a 64-bit version of Ubuntu 13.10. I want to run a 32-bit version of a program. However I see ia32-libs is not included in 13.10. Is there a replacement package for this or what?
45
votes
5answers
77k views

What is the correct way to completely remove an application? [duplicate]

I've searched the net for such information and found different command lines, like these ones: sudo apt-get remove application sudo apt-get remove application* sudo apt-get remove --purge ...
24
votes
10answers
13k views

How do I install and manage RPMs?

I have a burning desire to install RPMs onto my Ubuntu installation - is this possible? Can I use Yum - or another RPM Package Management tool?
57
votes
11answers
7k views

Why can't I update applications without upgrading the whole OS?

In Ubuntu, once a release is out the software one has installed receives security updates only. In Windows, I can get new versions of programs with new features. How can Windows do this and why can't ...
10
votes
2answers
31k views

How do I enable the “multiverse” repository?

I keep seeing places refer to the "multiverse" repository as a place I can get software, how can I enable this repository? Please specify how to do this graphically and via command line.
7
votes
3answers
7k views

Cannot install any software from the Software Center due to ttf-mscorefonts-installer package error

When I try to install any software from ubuntu software center it comes with error: An unhandled error occured There seems to be a programming error in aptdaemon. This is the software that allows you ...
10
votes
4answers
60k views

trying to overwrite '/usr/bin/opencv_haartraining', which is also in package libopencv2.3-bin 2.3.1+svn6514+branch23-12~oneiric

After installing some packages and libraries I have an error on Package Manager, I can't run any update because it says: The package system is broken If you are using third party repositories ...
25
votes
6answers
18k views

How do I enable the “partner” repository?

I keep seeing places refer to the "partner" repository as a place I can get software, how can I enable this repository? Please specify how to do this graphically and via command line.
49
votes
5answers
12k views

How do I find the package that provides a file?

Simple enough question: is there some shell command (or GUI method) I can use that, given the path to a file on my system, tells me what package put it there? Assuming the file did in fact come from a ...
38
votes
3answers
83k views

How can you completely remove a package?

I am trying to do a clean install of the octave3.2 package. To do this, I removed it, then tried to reinstall it. When I reinstalled, an error occurred. It could be a bug in the package, but I ...
5
votes
6answers
20k views

Package system is broken. How to fix it?

I just recently bought an arduino and requires gcc-avr/avrdude to compile the software. I installed avr for another microprocessor component a while ago but is obviously an outdated version (gcc ...
103
votes
6answers
32k views

Is aptitude still considered superior to apt-get?

When I first started with Ubuntu using aptitude was the 'in-thing', with some stated improvements over apt-get. Am I correct in saying that apt-get has now 'caught up' with aptitude, and it makes ...
18
votes
4answers
36k views

How do I re-install Network Manager without an internet connection?

I have only wireless connection, one computer with a connection and 4gb usb . My second computer has no network connection, because I have deleted it from the software center. However, now I want to ...
2
votes
3answers
7k views

What should I do when the GETDEB repository is down?

I'm trying to install programs/files from the getdeb repo but get a "check your internet connection" error. Programs than I've tried include Qbittorrent and Mozilla-Plugin-VLC. Through the ...
166
votes
10answers
116k 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 ...
29
votes
3answers
16k 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 ...
22
votes
6answers
8k views

How do I remove all packages from a certain repository?

For a smooth upgrade from 10.04 to 10.10, I would like to remove all packages which are not in the default repositories (e.g. chromium PPA and third-party repositories). What is the easiest way ...
13
votes
3answers
3k views

How do I add the “proposed” repository?

I'm trying to either test a fix that's been proposed or I want to volunteer to test stable release updates before they are pushed out to general users, how can I enable the "proposed" repository?
11
votes
3answers
5k views

APT wedged by kernel version mismatch

Apt is seemingly unable to do anything useful for me, repeatedly giving messages of this form: dpkg: dependency problems prevent configuration of linux-server: linux-server depends on ...
12
votes
3answers
23k views

How do I enable the “Universe” repository from the command line?

How do you use terminal to enable Universe source? Or any those 4 from Software Sources: Main, Universe, Restricted, Multiverse Main is on by default and Restricted is on if durring Ubuntu ...
11
votes
7answers
82k views

How to configure proxy authentication to work with Ubuntu Software Center?

I have tried put in apt config Acquire::http::proxy, and in Network>Network proxy with and without user:password@server:port and using environment variables http_proxy and https_proxy. Nothing seems ...
16
votes
0answers
6k views

How to find and delete duplicated sources list entries? [duplicate]

Is there a command line to find and delete duplicated entries in the /etc/apt/sources.list file? or is this possible via synaptic perhaps?
95
votes
9answers
4k views

What's the difference between package managers?

I know Ubuntu/Kubuntu has several programs that can be used to install packages, such as apt-get, aptitude, and synaptic (and perhaps others). What are the differences between them, and which one is ...
17
votes
6answers
4k views

How do I list installed software with the installed size?

I would like to have a list the installed software on my machine, with the disk space consumed by them alongside. I would prefer to be able to order by largest/smallest, but that is not a necessity. ...
14
votes
2answers
23k views

How do I enable the “backports” repository?

How to enable the backports repository so I can get newer versions of software?
8
votes
6answers
12k views

How can I install 'restricted-extras' offline?

I currently don't have internet access in the house which means I have to go the cafe after a fresh 11.04 install, can anyone provide a link where I can get a .deb package (amd64) of ...
6
votes
8answers
3k views

How to completely remove kubuntu-desktop from Ubuntu

I installed kubuntu-desktop just to experiment with its interface. Then I decided to remove and did the traditional apt-get purge and autoremove but it seems elements of kubuntu are still there. For ...
4
votes
4answers
7k views

Unable to use package manager due to “exclusive lock” error

My synaptic package manager in ubuntu10.10 is giving error: Unable to get exclusive lock This usually means that another package management application(like apt-get or aptitude) is already ...
0
votes
1answer
966 views

error occured while running sudo apt-get install -f

I get this error Sub-process /usr/bin/dpkg returned an error code (1) so I tried sudo apt-get clean and autoclean. When I ran sudo dpkg --configure -a: Errors were encountered while processing: ...
84
votes
6answers
53k views

How can I install just security updates from the command line?

sudo apt-get upgrade installs all updates, not just security updates. I know that I can use Update Manager to select only important security updates, but is there a way to do this from the command ...
21
votes
1answer
11k views

Restoring all data and dependencies from dpkg --set-selections '*'

So I can run on one machine: dpkg --get-selections '*' > selection.txt On another machine: dpkg --set-selections < selection.txt ... followed by either of the following: aptitude install ...
17
votes
1answer
4k views

Should I use tasksel, tasks in APT or install regular metapackages?

Tasksel or plain Apt? In the past I've always used tasksel to install so-called "tasks". It seems, however, that this has been integrated in APT: apt-cache dumpavail | grep ^Task [...] snip Task: ...
14
votes
6answers
13k views

Adding Debian Sid as Package Repository?

I am running 12.04 Precise beta (upgraded from 11.10 Oneiric) and I added the following line to my /etc/apt/source.list: deb http://http.us.debian.org/debian unstable main contrib non-free In order ...
9
votes
3answers
32k views

How to resolve “Failed to download repository information”?

Whenever I try to install anything with the Ubuntu Software Center, the following error appears. Failed to download repository information Check your Internet connection. E:Unable to ...
-3
votes
1answer
155 views

How to solve Unable to locate package error

There are many question in which users face error: E: Unable to locate package ... . The following error while sudo apt-get install <package>: sudo apt-get install package Reading package ...
2
votes
3answers
4k views

Unable to install any packages due to unrecoverable fatal error /var/lib/dpkg/diversions

I am currently unable to install any packages. I receive the following error: dpkg: unrecoverable fatal error, aborting: too-long line or missing newline in `/var/lib/dpkg/diversions I have ...
23
votes
4answers
14k views

How to list package dependencies (reverse dependencies)?

In order to research what caused the installation of a given package, I'd like to get a list of packages which depend on that package. I couldn't find anything obvious in man dpkg.
14
votes
4answers
62k views

Where are my installed applications? [duplicate]

I have installed skype in ubuntu but duuno where to start the installed the skype application .Similarly I have installed netbeans and many applications but after installing them their icon's are not ...
24
votes
6answers
33k views

How to uninstall a .deb package?

Suppose I download a .deb package from a website and install it. (I assume that when I double click the .deb file, the package is installed through a GUI that interfaces with dpkg right?) How can I ...
9
votes
8answers
31k views

How to check if Network Proxy is really applied?

I'm trying to set Network Proxy to use my LAN's internet connection to update packages. while the proxy settings works on my firefox, but the package manager still cannot connect to Internet. I have ...
13
votes
3answers
4k views

What is the easiest way to strip a desktop edition to a server edition?

We have installed Ubuntu desktop edition on our development server. Now that we have it in a data center we would like to strip it down to a server edition. Is there an easy way of doing so rather ...