It looks like sssd is not running (see "connection refused" error below):
Nov 24 19:31:08 hostname login[1686]: pam_unix(login:auth): check pass; user
unknown
Nov 24 19:31:08 hostname login[1686]: pam_sss(login:auth): Request to sssd
failed. Connection refused
Nov 24 19:31:08 hostname login[1686]: Libgcrypt warning: missing initialization
- please fix the application
Nov 24 19:31:08 hostname login[1686]: pam_unix(login:account): could not
identify user (from getpwnam(sct-muc))
Nov 24 19:31:08 hostname login[1686]: Authentication failure
I suggest you inspect the sssd logs and try to figure out why it hasn't
started properly. There are other services that failed to start, like
smartd, so maybe something went really wrong with the release upgrade.
** Changed in: krb5 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1644626
Title:
Login does not work with krb5 after upgrade to 16.04.1 from 14.04.5
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