| Big thank you @maxxedout!  I have had a black screen instead of a login screen for about two weeks after a dist-upgrade to my aptosid machine, and       Code: 
apt-get install libqt5xcbqpa5
brought back my login screen.  No other suggestion I had found in the last two weeks did anything to help. 
 After my dist-upgrade, startx would fail to start with a message:
       Code: 
xf86EnableIOPorts: failed to set IOPL for I/O (operation not permitted)
and the fix suggested by maxxedout worked.  I'm typing all this here so someone else with a similar Plasma 5 transition headache might be led here by a web search. |