Confirmed! I launched BUM, and lightdm was not selected. I activated it, rebooted, and everything is back to normal (the graphical login goes on normally). Hope this helps!
-- 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/1119209 Title: Lightdm does not start on a netboot of Kubuntu 13.04 Status in “lightdm” package in Ubuntu: Confirmed Bug description: When booting the Kubuntu 13.04 daily-image (2013-02-07) over the network (pxe/netboot), lightdm fails to start automatically. There is no mention of lightdm in the syslog, and if you start lighdm manually it starts without errors. Ubuntu version: Kubuntu 13.04 daily (2013-02-07) Lighdm version: 1.4.0-0ubuntu3 Expected: Lighdm to start automatically What happend: Got to tty1, lightdm doesn't seem to even try to start. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: lightdm 1.4.0-0ubuntu3 ProcVersionSignature: Ubuntu 3.8.0-4.9-generic 3.8.0-rc6 Uname: Linux 3.8.0-4-generic x86_64 ApportVersion: 2.8-0ubuntu4 Architecture: amd64 CasperVersion: 1.330 Date: Fri Feb 8 09:09:47 2013 LiveMediaBuild: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130207) MarkForUpload: True SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1119209/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

