This issue is caused by a simple error in the postrm script

>       if [ -d /var/run/sddm ]; then rm -r /var/run/sddm/authority; fi
The directory exists, but the file does not.


Workaround:
Stop ssdm to be sure those files won't be missed.
Delete /var/run/sddm before purging the package.

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https://bugs.launchpad.net/bugs/1422247

Title:
  package sddm (not installed) failed to install/upgrade: subprocess
  installed post-removal script returned error exit status 1

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