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Currently, when I run the Update Manager in 12.04.1 LTS , I get since some weels:

Screen shot

How can I update from this state?

Update

$ sudo apt-get update
Get:1 http://at.archive.ubuntu.com precise Release.gpg [198 B]
...
Hit http://at.archive.ubuntu.com precise-backports/universe Translation-en
Fetched 198 B in 1s (146 B/s)
Reading package lists... Done
W: GPG error: http://at.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key 

marked as duplicate by Avinash Raj, jobin, fossfreedom May 20 '14 at 14:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Please post the contents of your /etc/apt/sources.list file. Also, try running sudo apt-get update and then run the Update manager again. – terdon May 20 '14 at 13:18
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    Before you start closing questions , help others then close it , as @terdon always do , let other know what is there solution maybe same question but it should be done in other solution – nux May 20 '14 at 13:35
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    @nux Dupe-closing should help. That's the point of it. Rather than answering the exact same question infinite times, we answer it once and push everybody else there. – Oli May 20 '14 at 14:33
  • ok am with you , but we should ask Op about his problem , and be sure that the other answer fix his problem – nux May 20 '14 at 14:34
  • See also: askubuntu.com/questions/1877/… – Seth May 20 '14 at 14:35
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To solve this problem , open terminal then try these commands :

sudo apt-get clean 
cd /var/lib/apt 
sudo mv lists lists.old 
sudo mkdir -p lists/partial 
sudo apt-get clean 
sudo apt-get update

Then try again to update your system .

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