When I am opening Update manager, it writes, that "Not all updates can be installed" and partial upgrade proposed.
What does this mean?
Am I correct thinking that "upgrade" means changing Ubuntu version to higher than mine? Or this is mistype? I would like not to change OS version.
Simultaneously I had multiple problems with software repositories and keys, which were solved. Is this related?
This situation is nothing to worry about. It happens mainly when there are several updates in a row and you should see it solved without any extra work within a day.
It is almost never useful to "Run a partial upgrade" - better wait.
sudo apt-get dist-upgrade, sudo apt-get upgrade or sudo apt-get update do not upgrade the system to the next version - the names are rather misleading, they come from how they were used in Debian-systems.
Best - try to invoke 'sudo apt-get dist-upgrade -u' in a terminal window.
– H.-Dirk Schmitt Feb 11 '13 at 14:51dist-upgrademean what I don't want to do? – Suzan Cioc Feb 11 '13 at 16:20