For my point of view getting a working system after upgrade is more important than choose a display manager!
As you can see in https://bugs.launchpad.net/ubuntu/+source/nvidia- settings/+bug/840462 , the debconf question - where i chose lightdm - left me with an unusable system (infinite loop of xserver when logging in.). Switching back to gdm (which to found out took me hours) brought back the system. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/806559 Title: debconf prompt about DM to use during natty->oneiric Status in “lightdm” package in Ubuntu: Triaged Status in “lightdm” source package in Oneiric: Triaged Bug description: During a stock natty->oneiric upgrade test I got a debconf prompt asking me about my default DM (lightdm, gdm). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/806559/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp