I use Kubuntu and two days ago I upgrade kde with backports resources. This morning it showed black screen only.
I tryed to sudo apt reinstall kde-plasma-desktop but i have some problems:
-plasma desktop : depends: plasma-workspace (>= 4:5.24.2) but it’s not installable
libnotificationmanager : depends: libkf5screen7 (>= 4:5.24.4") but it’s not installable
recomends kinfocenter (>= 4:5.23.90") but it’s not installable
recomends kscreen (>= 4:5.23.90") but it’s not installable
E: Impossible to correct errors: some blocked packages are broken