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 &lt;email address hidden&gt;


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.



Question: Adding existing user to existing group and providing permissions
Answer: New groups are only picked up when the user logs in. Log the ubuntu user out then in again.