Package Manager & Update Manager problems

[Akacheebe]

Does executing these commands help?

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

This will rebuild the cache.

This one fixed the update errors on my system.

[buminda]

thx mate . this worked for me !!

[sugat_itlog]

I just change my download source.

my error was ...
GPG error: http://us.archive.ubuntu.com oneiric-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>


You can do the above steps it just that you have to re-add the other repository that you had before renaming the lists folder. Its linux and you can do different methods but same result.