upgrade from 10.04 to 10.10 fails with msg could not calculate the upgrade

view full story

http://www.linuxquestions.org – I was updating from 10.04 to 10.10 (was updating through update manager)) after some time I got following message Code: 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 against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bug (HowTos)