Problem:
The update is blocked, because cool-solutions are installed.
Component 'cool-solutions' is not yet available
Solution:
The Cool Solution Repository for UCS 4.4 is now available. You can now update by setting the UCR variable, shown in the message block.
However, most Cool-Solutions are not yet adapted and tested. So it may happen that they don’t work.
In the linked Wiki https://wiki.univention.de/index.php?title=Category:Cool_Solutions you can see if the Cool-Solution is already released.
Investigation:
To check which Cool Solutions have been installed, proceed as follows
You check once from which package source all packages that have been installed come, e.g.
dpkg -l | grep ^ii | awk '{ print $2 }' | xargs apt-cache policy | grep -E ':$| (500|100) ' > package-url.txt
The generated file should show the package you are looking for.
grep -B2 cool package-url.txt