Debian does not poweroff after update to stretch

I had the problem that when shutting down, Debian Linux (stretch) only halts („System halted“), but does not switch off the computer. Strangely enough, it works if you shut down from the console:

sudo poweroff

The cause was that kdm, which does no longer exist on Debian stretch, was still installed and used, instead of the new sddm.


sudo apt-get install sddm kdm-

to remove kdm and install sddm fixed the problem.

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