[sudo-users] "sudo -i" run time error

[Todd C. Miller]

For some reason pam_open_session() is failing.  What version of
Linux and sudo are you running?  Sudo 1.8.17 and higher should
ignore pam_open_session() failures.

If you have sudo 1.8.7 or higher you should be able to add a line
like the following to sudoers:

Defaults !pam_session

to work around the problem.

 - todd