I run upgrade after installing all recommended updates from update manager, and I got dialog:

Could not calculate the upgrade



An unresolvable problem occurred while calculating the upgrade:

E:Unable to correct problems, you have held broken packages.



 This can be caused by:

 * Upgrading to a pre-release version of Ubuntu

 * Running the current pre-release version of Ubuntu

 * Unofficial software packages not provided by Ubuntu



If none of this applies, then please report this bug using the command 'ubuntu-bug update-manager' in a terminal.

So I reported bug.

I also tried

umpirsky@umpirsky:~$ sudo apt-get update

...

Fetched 16.6 kB in 1min 22s (200 B/s)

Reading package lists... Done

W: GPG error: http://archive.canonical.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

Any workaround for this?

• What is the easiest way to resolve apt-get BADSIG GPG errors?


• First and second solution didn't work, last one returned cd: /var/cache/apt-cacher-ng: No such file or directory. Still getting GPG error.