I’m seeing the same problem.
One interesting thing to look at is /var/log/auth.log:
Jan 19 00:40:11 drowelf polkit-agent-helper-1[5553]: (pam_krb5): none:
pam_sm_authenticate: entry (0x0)
Jan 19 00:40:11 drowelf polkit-agent-helper-1[5553]: (pam_krb5): user:
attempting authentication as u...@kerberos.domain
Jan 19 00:40:15 drowelf polkit-agent-helper-1[5553]: (pam_krb5): user:
pam_sm_authenticate: exit (success)
Jan 19 00:40:15 drowelf polkit-agent-helper-1[5553]: (pam_krb5): user: cannot
retrieve principal from cache: Credentials cache permissions incorrect
I think this and bug #476069 are probably closely related if not
different symptoms of the same bug.
** Changed in: policykit (Ubuntu)
Status: New => Confirmed
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polkit-grant-helper-pam general protection fault (SIGSEGV) when using Kerberos
https://bugs.launchpad.net/bugs/476953
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