Comment 23 for bug 260687

When upgrading from saucy to trusty, something similar happened to me, the upgrade failed, because the samba upgrade failed because it didn't like that there was a secrets.tdb in both /var/lib/samba and in /var/lib/samba/private, and the fix was similar to joctee's comment in posting #21, but then purging libpam-winbind instead of libpam-smbpass... Note that a failure that 'breaks' sudo is can be difficult (or frustrating) one to fix for many users, because not everybody will know about or how to get a root shell without it.