Update from Xubuntu 11.04 to 11.10: same problem, endless crash loop.
Fix: change 'greeter-session' in /etc/lightdm/lightdm.conf to lightdm-gtk-greeter
So, only the last step Andreas proposes is necessary. Unity-greeter segfaults, so just use lightdm-gtk-greater, and you're done.
Please fix this, a lot of Xubuntu-users will be thankful. It's just a simple conf-File that needs to be fixed, and this bug renders Xubuntu unusable. (It took me several days to pin it down.)
Update from Xubuntu 11.04 to 11.10: same problem, endless crash loop.
Fix: change 'greeter-session' in /etc/lightdm/ lightdm. conf to lightdm-gtk-greeter
So, only the last step Andreas proposes is necessary. Unity-greeter segfaults, so just use lightdm- gtk-greater, and you're done.
Please fix this, a lot of Xubuntu-users will be thankful. It's just a simple conf-File that needs to be fixed, and this bug renders Xubuntu unusable. (It took me several days to pin it down.)