I am on Xubuntu 14.04. I don't understand the cause of the following warning message I get.
When I check only the Universe repository, Software Updater tells me that my system is up to date.
When I check the following repositories in Software Updater:
I get a list of package to update. Up to now, everything is sound.
Now, if I check only the following repositories:
I get the message "Not all updates can be installed".
If I click Continue, I get a list of packages to update but a number of them are unchecked and cannot be selected:
- Complete Generic Linux kernel and headers
- Generic Linux kernel headers
- Generic Linux kernel image
- GTK+ graphical user interface library
- Programs for the GTK+ graphical user interface library
Can it be that these packages are in the Universe repository and that I get the warning because I did not check this repository? But then, how comes I am not offered to upgrade them when I check just Universe?
I did a
sudo apt-get install -f and it says:
0 upgraded, 0 newly installed, 0 to remove and 44 not upgraded
How can I make sense of this behavior? I know I could just check all three repositories: Main, Restricted and Universe, and just proceed to update; but I would like to get a deeper understanding.
PS: I have 'Important security updates' and 'Recommended updates' checked and I did not check any of the Other Software repositories.