Confirming issue exists on Kubuntu 20.04.4 LTS.
Every attempt to login from the graphical login screen makes this error
appear in authlog:
/var/log/auth.log:Apr 27 13:56:16 <hostname> kcheckpass[3516]:
pam_ecryptfs: seteuid error
Quick "fix" of the symptom, i.e. make the error go away is to add the
seteuid-bit permission to kcheckpass (owned by root):
sudo chmod u+s /usr/lib/x86_64-linux-gnu/libexec/kcheckpass
However, this seems like a too broad privilege grant so I'm not sure it is a
good idea.
Personally, I prefer to have the spurious error in the log over this broad
privilege grant.
Note that login succeeds despite the error appearing in authlog.
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https://bugs.launchpad.net/bugs/1085706
Title:
pam_ecryptfs: seteuid error
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https://bugs.launchpad.net/ecryptfs/+bug/1085706/+subscriptions
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