Hi ,
don't you want the updates ? I don't understand. Sorry.

Sometimes Update manager(GUI) cannot handle correct the updates-upgrades. At this situation is good to run apt-get from terminal , and see detailed errors. Maybe apt-get will handle successfully the updates and your problem will be solved just as simple.

Try to accept the updates and see if any errors occur.

If you want to see what dist-upgrade does , then open a terminal and
Code:
man apt-get
and search for dist-upgrade to read.

Thanks