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After I installed Ubuntu , I cannot update any software with the error message "failed to download package files". After having googled, I have tried:

  1. sudo apt-get update
  2. sudo apt-get upgrade
  3. changed to another sources

But I still got the same error message. And there is no problem with internet connection as i can connect to internet using Firefox in Ubuntu.

Any ideas?

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I had the same problem after upgradin from 13.10 to 14.04. It was fixed by running: sudo rm /var/lib/apt/lists/* -vf & sudo apt-get update See ubuntuforums.org/… –  parvus May 11 at 9:26
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3 Answers 3

Press Alt+F2 and type software-properties-gtk.

Change the download location to Main Server or another server close to the country you live in and try to sudo apt-get update again.

enter image description here

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Run the following commands (saves a backup of the old lists and creates a new lists folder) and the BADSIG error does not occur:

cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get update
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There's a Package Manager Troubleshooting Procedure that usually solves this sort of problem. Perform steps 1-4 of that procedure. (Step 1, which is sometimes enough, is what Bruno Pereira has posted--in better detail--in this answer. If step 1 isn't enough, continue with the other steps.)

If that doesn't solve the problem, then please select all the text in the Terminal (Edit > Select All), copy it to the clipboard (Edit > Copy), and edit your question to include it (you'll want to make it a blockquote so that the formatting doesn't get messed up). This will then provide highly useful information for solving the problem.

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protected by RolandiXor Dec 19 '13 at 1:44

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