Do you have the libpam-mount package installed? Maybe the report that /etc/pam.d/common-pammount fixes it was a red herring - you don't have any mention of pam_mount in /etc/pam.d/common-auth, either. The other explanation is simply that sudo is not configured to allow root to use it. Can you post your /etc/sudoers?
Do you have the libpam-mount package installed? Maybe the report that /etc/pam. d/common- pammount fixes it was a red herring - you don't have any mention of pam_mount in /etc/pam. d/common- auth, either. The other explanation is simply that sudo is not configured to allow root to use it. Can you post your /etc/sudoers?