Totem could not play ‘dvd:///media/cdrom0′.

Problem: when you install Ubuntu, the default player Totem will not play dvds. It requires that certain codecs be installed. The forum linked to below solves this problem.

The solution is at Linux Forums. Thank you ‘antidrugue’ at Linux Forums

update

New codec problem with Totem
requires
MPEG 1 Layer 3 CBR

Solved January 18. Unfortunately I can’t remember how I did it. Automatix?