@wxl:
Yes, your steps to reproduce are correct. Except that I did not try it
with pkexec. Instead I tried it with diskmanager, which automatically
asks for root privileges. (I do not know which program it invokes.)
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I can confirm the remedie of removing all other users except one from
the sudo group (see psychotrain65 from 2020-06-14):
I had two users as sudo. I removed them alternately. As long as I had
only one user in sudo everything worked as expected. It did not matter
which user. As soon as two users we