Bug#454097: After upgrade, gdm can start only Failsafe xterm session

[Chris Lesniewski-Laas]

I also encountered this problem after a recent upgrade --- my .profile exec's
another more preferred shell, which causes gdm's Xsession to bail out entirely.
Is there any good reason for gdm's Xsession to source ~/.profile?  It is very
contrary to the principle of least surprise: nothing else other than a login
shell sources ~/.profile.  And it seems to create a lot of hard-to-debug login
problems.

Cheers,
Chris