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When I am opening Update manager, it writes, that "Not all updates can be installed" and partial upgrade proposed.

What does this mean?

enter image description here

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?

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Please provide any log output and descriptions of your former problems. Best - try to invoke 'sudo apt-get dist-upgrade -u' in a terminal window. – H.-Dirk Schmitt Feb 11 '13 at 14:51
Doesn't dist-upgrade mean what I don't want to do? – Suzan Cioc Feb 11 '13 at 16:20

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.

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