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I use the update center and the Ubuntu software center, they worked fine until I installed an update and then I hit "Check" in the update manager and it goes through in 2 seconds and says all downloads failed. the software center I click on the "more Info" button and it says (where it should say install)"add Source" I have Internet access but it doesnt even give me an error notice, I can download ANYTHING from the software center, and there hasnt been an update for over 15 days, with checking. I have tried updating through Terminal, but there is something wrong with the entire download and update process. seems I cant download anything at all now.

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3 Answers 3

Go to Ubuntu Software ~> Edit ~> Software Sources...

There go to Ubuntu Software tab and at bottom,infront of 'Download From:' click on toolbar and select 'Other...'

There you have two ways:

  1. Press 'Select Best Server' and let it select best server it recommends for your country.
  2. Choose a server by yourself.

Hope it helps.

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sudo apt-get remove software-center sudo apt-get install software-center

Run these two commands in Terminal mode

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Since software-center is working I wouldn't uninstall it. –  John S Gruber May 26 '12 at 2:47
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This sounds like your software sources list got messed up in some way causing the updater to abandon the search. After trying it, do a tail -n 200 /var/log/syslog | less to see if any specific error was reported. Then, ...

  • When you have Update Manager running, click on the Settings button in the lower left of the window to look at your sources and be sure to check all the tabs. OR ...

  • When you have the Software Center running, go to the Edit Menu and click on Software Sources to see the same thing.

  • If you don't see anything obvious, it is time to get out the big guns. Do a less /etc/apt/sources.list and carefully examine it all. Next, less each file in /etc/apt/sources.list.d/ and look for anomalies.

Hope this helps.

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