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I am a new Ubuntu user.12.04(32 bit ) version.I not update Ubuntu for 1 month. Now when I want to update using terminal sudo apt-get update then shows that:

reading package list done.....
:GPG error: http://in.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://in.archive.ubuntu.com precise-backports Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

And when I want to update using update manager then shows the massage that:

The action would require the installation of packages from not authenticated sources.

How can I solve this problem?

snoop
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m.bhandari
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1 Answers1

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run these commands:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5
sudo apt-get update && sudo apt-get upgrade

The first command downloads key 40976EAF437D05B5 from keyserver.ubuntu.com, and the next one updates your package list, then applies the needed updates.

waltinator
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Alex Jones
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  • update can be done using "sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5" "sudo apt-get update && sudo apt-get upgrade"...@edward torvalds but when i want to install softwares from ubuntu software center the massage shows that "The action would require the installation of packages from not authenticated sources." Now how can i install softwares??? – m.bhandari Sep 27 '15 at 14:53
  • @m.bhandari try this: http://askubuntu.com/questions/184117/requires-installation-of-untrusted-packages?lq=1 also if you can install software you can try this: http://askubuntu.com/a/545052/294611 – Alex Jones Sep 27 '15 at 15:11