Refering to editing the software sources in Ubuntu. Can be done graphically through System Settings > Software Sources or from the command line using APT.

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4
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1answer
8k views

GPG ERROR NO_PUBKEY : WARNING: The following packages cannot be authenticated! [closed]

I have just stared to receive some strange errors regarding GPG keys. Namely I have just added ppa:ubuntu-toolchain-r/test and wanted to update and after that I got this: W: GPG error: ...
15
votes
2answers
26k views

How do I enable the “backports” repository?

How to enable the backports repository so I can get newer versions of software?
12
votes
3answers
34k 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 ...
19
votes
2answers
37k views

How do I change mirrors in Ubuntu Server from regional to main?

I have a Lucid Server (10.04) set up and I would like to change the mirror from US (or any other country) to the Main Ubuntu Mirror. For example my two first entries in sources.list are: deb ...
0
votes
1answer
32 views

Can I install all the hacking tools of KALI on Ubuntu12.04 LTS?

I want to know is there any way to install all hacking tools of kali on ubuntu 12.04 ? If yes then pls tell me how ? like sqlmap , nikto , john , aircrack-ng etc . Thanks.
1
vote
1answer
4k views

Ubuntu 13.04 can't open software & updates / software sources

I am using MacBook Air Mid 2012 running Single OS which is Ubuntu (Raring Ringtail). Its been a month I'm using Ubuntu and everything works fine, recently i can't open software & updates, when i ...
0
votes
2answers
73 views

How to List all software installed on Ubuntu 14.04 and Uninstall them

I am beginner to Ubuntu. I have installed ubuntu desktop 14.04 and have tried to install PHP, Apache, MYSQL and PHPMYADMIN through terminal. I have tried many commands but have only installed Apache ...
0
votes
1answer
31 views

How to installed Teelgarm Desktop in Ubuntu 14.04 LTS

I am beginner to Ubuntu. I want to install Telegram Desktop software on my Ubuntu 14.04 LTS. I have downloaded the tsetup.0.6.15.tar.xz file. Now I want to know how to proceed further. Kindly help ...
0
votes
0answers
23 views

Ubuntu precise mirror not found

I have a precise that it's not able to connect to the repositories. The truth is that the server has been working with no maintenance for long time, but everything else seems fine. This is my ...
0
votes
0answers
22 views

problem with source file in sources.list.d directory

When I was trying to update program and system by Ubuntu Software Center. Internet cut off and now I can not download any software to download Ubuntu Center and can not install through Terminal? What ...
14
votes
3answers
48k 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.
0
votes
1answer
112 views

Failed to install untrusted sources and failed to download update information

I changed my server from fastest available to main server, while trying to fix the issue with software manager (untrusted sources failing to install FYI) and I got an error. Here's an error I get: ...
0
votes
0answers
32 views

Advanced Full Screen Debugger (AFD) with NASM

I'm new to Ubuntu/Linux and studying a subject of assembly language which uses NASM and AFD on a DOS machine. I installed NASM successfully, generated a .com and .lst file successfully but need AFD to ...
0
votes
2answers
801 views

How to build the Darling project on Ubuntu?

The Darling project is an open source Darwin/OS X emulation layer for Linux. I downloaded the source code with git and tried to build it with cmake but it failed. The document says I need these ...
1
vote
0answers
39 views

How to make my own new Ubuntu based operating system?

I want to make my own new Ubuntu based operating system. With New custom theme and lot of softwares pre-built ! Can I do it only with UCK (Ubuntu Customization Kit) ? Then how ?
1
vote
1answer
3k views

Can't install from Ubuntu Software Center in 13.04

I am a new user to Ubuntu, presently using Ubuntu 13.04 32-bit. I can't install any software from the Ubuntu Software Center. I am getting errors such as: failed to download repository information.
1
vote
2answers
88 views

How to change the repository location while installing from live cd?

I am installing 14.04 from a live CD. While installing, it downloads updates from the Internet. I see it is currently downloading from http://in.archive.ubuntu.com/ Is there any way I can change ...
-1
votes
1answer
50 views

About open source and closed source [closed]

I saw Google's Chrome OS which is running on the Chromebooks and Chromeboxes and I heard that Chrome OS is cosed-source on the Chroomeboks and the open-source version is called Chromium OS. So, Chrome ...
0
votes
3answers
3k views

I can't find any of my downloaded apps in the dash

I have just installed Ubuntu and have problems with finding any of the apps/programs that I have downloaded form the software center. When I search for them in the dashboard they are not there. I have ...
0
votes
1answer
28 views

Errors adding software sources

Help! I'm running ubuntu 14.04 LTS With all updates installed. I can't add any sources. When I open software center and go edit>sources>other software. I hit add and enter "deb ...
2
votes
0answers
16 views

Verbose debugging from apt-get

I've created what I THINK are correct local mirrors of the Ubuntu repositories locally. When I attempt to do an apt-get install on a package that SHOULD be there, it always returns: Reading package ...
-1
votes
1answer
113 views

“E: The list of sources could not be read.” while trying to update [duplicate]

i am get this error while trying to run update command mostafa@mostafa-Satellite-C660:~$ sudo apt-get update E: Type '<!DOCTYPE' is not known on line 1 in source list ...
0
votes
1answer
210 views

Fresh Server 14.04 install: “Unable to locate package (xyz)” for everything; How do I edit sources.list?

I can't install anything with apt-get on my fresh 14.04 Server installation. I get Unable to locate package [xyz] for everything I try. sudo apt-get update does nothing. This page implies that I need ...
0
votes
0answers
27 views

Problems with USB devices

I'm a newbie when it comes to Linux, but I've been using it in quite a while and I'm enjoying so much! But since I edited my /etc/apt/sources.list file I've had a problem with downloading packages, ...
1
vote
3answers
732 views

Ubuntu 14.04 - Software Center - Edit->Software Sources disabled

The button in Software Center→Edit→Software sources... is disabled. Is there another way to reach it or simple enable the button? What could be causing it? If I know I can fix it myself ...
0
votes
1answer
266 views

Why is GNOME Software Center not included in Ubuntu GNOME (14.04/14.10)?

So I installed Ubuntu GNOME 14.04 (which included GNOME 3.10) and noticed that GNOME Software Center isn't included and isn't available through the repositories. Then I tried installing Ubuntu 14.10 ...
2
votes
0answers
134 views

Fixing sources.list on arm archirecture

I have Linaro Ubuntu installed on ARM device (Zynq Mini-ITX development board). Here is my # lsb_release -a output: Distributor ID: Ubuntu Description: Ubuntu 12.04.5 LTS Release: ...
1
vote
2answers
7k views

Duplicate sources.list entry [duplicate]

Using Ubuntu 14.04 LTS. sudo apt-get update thats all i ran, and it'd start off real smooth, then it'd get to a part where it gets stuck for like a fair ammount of time after which it'd display ...
8
votes
5answers
22k views

How to fix “-5 No address associated with hostname error” while updating?

I am getting this error frequently while updating Ubuntu 12.04 LTS. How can I fix it? Log is: Ign http://archive.scrapy.org precise/main Translation-en Fetched 6,620 kB in 1min 21s (81.2 kB/s) W: ...
0
votes
1answer
77 views

How to fix the following error during an update? [duplicate]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/quantal/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80] E: Some index files failed to download. They have been ...
5
votes
4answers
68k views

A “failed to fetch” error occurs when apt-get update is run. How do I fix this?

Contrary to the note above, I haven't found the answer to my problem. I have read almost a dozen apt-get update questions, most from askubuntu.com, with "failed to fetch" errors and tried the ...
1
vote
0answers
77 views

Synaptic Package Manager -E-“cache open”, E - Default-Release not available

In an attempt to re-install Bash I tried to open Synaptic Package Manager but got this message E: The value 'precise-updates' is invalid for APT::Default-Release as such a release is not available in ...
0
votes
1answer
44 views

Malformed line 1 in source list /etc/apt/sources.list.d/canonical_partner.lis [duplicate]

When I I try to install any program, I get this error: E: Malformed line 1 in source list /etc/apt/sources.list.d/canonical_partner.list (dist parse) E: The list of sources could not be read.
0
votes
0answers
83 views

Keryx Installation error [duplicate]

Dependency is not satisfiable: python(<2.7) What is the meaning of this error? And how do I troubleshoot ?
1
vote
3answers
9k views

Unable to edit /etc/apt/sources.list file

When I try to edit sources.list file using the command: $:gksu gedit /etc/apt/sources.list It request for administrative password and when I type the password, It says incorrect and try again.What ...
4
votes
1answer
144 views

Is it possible to add a location/folder on my hard disk to sources.list?

Is it possible to add a location/folder on my hard disk (ex: /media/Data/Ubuntu) to the sources.list? If possible,how?
1
vote
1answer
143 views

Trying to PXE Install 14.04 with local mirror, but install keeps reaching out to canonical IPs

I have a local mirror setup with apt-mirror, my /etc/apt/mirror.list file is included at the bottom of this post. Even though I have all of the repo's I can think of defined for some reason my VMs ...
0
votes
1answer
157 views

Ubuntu 12.04 updater not working

This is the error I keep on getting when I try to update anything. Ign cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5) quantal InRelease Ign cdrom://Ubuntu 12.10 _Quantal Quetzal_ ...
1
vote
0answers
88 views

Customized sources.list for custom live CD

I recently built myself a custom live CD of Xubuntu 14.04.1. This live CD is used to distribute to my customers to install on their machines with a set of pre-installed applications, some of which are ...
0
votes
0answers
22 views

Malformed line in apt sources [duplicate]

I am trying to use apt-get install and it is not working. I keep getting this: E: Malformed line 1 in source list /etc/apt/sources.list.d/libdvdcss.list (dist) E: The list of sources could not be ...
3
votes
2answers
298 views

How to use a sources list generator

I've been trying to install packages using terminal but I keep getting errors and it turns out my sources.list file is really messed up. So I found this webstite that generates a sources.list file ...
0
votes
0answers
117 views

How can I correct a 502 Proxy Error for a single source when updating sources on Ubuntu 14.04?

I am behind a proxy on Ubuntu 14.04 Trusty and need to add the source for MakerBot software and install the makerware software. When I add the source and run the command to update package lists, I get ...
1
vote
0answers
22 views

Possible to replicate sources.list as individual sources.list.d .list files?

I'm using puppet's apt module, & I'd like to clear out sources.list & have the same structure as individual sources.list.d .list files. I've tried several variations on the formatting of the ...
10
votes
2answers
5k views

What kind of content is in the Canonical Partners repository? Is it as secure & safe as the Main repo?

In Software Sources under the Other Software tab, there is an option of enabling "Canonical Partners" repository: software packaged by Canonical for their partners. Do I understand correctly that ...
1
vote
3answers
6k views

Upgrade from 13.04 to 14.04

I have Kubuntu 13.04 (unsupported release), and want to upgrade it to 14.04. When I'm trying to run do-release-upgrade I got this error: Traceback (most recent call last): File ...
4
votes
1answer
3k views

ttf-mscorefonts-installer is not available

I'm trying to apt-get install ttf-mscorefonts-installer in Ubuntu 10.04 LTS server, but I get Package ttf-mscorefonts-installer is not available, but is referred to by another package. Do I need ...
1
vote
1answer
23 views

How to backup and restore sources when upgrading to a newer version?

If I copy/paste the /etc/apt dir or just sources.list for that matter to a newer version, I will still have sources named for the old version (saucy for axample) which is not right. For example: deb ...
1
vote
0answers
34 views

404 Error for extras.ubuntu [closed]

sudo apt-get install and sudo apt-get update show 404 Error not found. So I checked the file /etc/apt/sources.list and replaced all (xx.)archive.ubuntu with old-releases.ubuntu. Everything works ...
1
vote
1answer
735 views

How can I install qtstalker?

I Wanted to install qtstalker, a stock market app on my Ubuntu 13.04. qtsalker is not available in the Ubuntu software center and sudo-apt-get install qtsalker gives the error: Unable to locate ...
2
votes
3answers
664 views

Where are the Programs in Ubuntu [duplicate]

I am new to ubuntu and linux world. Where can I see the list of all programs installed in ubuntu ? Ex: If I want to launch "terminal". I need to click the upper left icon and type "terminal". Where ...