As discussed on irc, the problem seemed to be that the plymouth-ready event was not being emitted since udev was not tagging a graphics device with PRIMARY_DEVICE_FOR_DISPLAY, so it looked like the problem was udev/kernel related.
According to jibel, if he enters the grub boot menu lightdm will reliably start suggesting that grub is possibly setting up the framebuffer which for some reason is not happening normally. Looking at the log in #22, we can also see that plymouth itself is crashing (SEGV). This may also suggest a problem with the graphics setup. I've just tried utopic-desktop-amd64.iso (20140923) under kvm and do not see the issue reported. ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- 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/1371651 Title: Daily does not boot into graphical interface after installation Status in Light Display Manager: Confirmed Status in “lightdm” package in Ubuntu: Triaged Status in “linux” package in Ubuntu: New Bug description: used the daily iso 2015-09-19 i386 ran installation on virtualbox 4.3.16 after installation, the system won't boot into the graphical interface. instead, switching to vt1 and back to vt7 reveals the attached errors. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: ubiquity (not installed) ProcVersionSignature: Ubuntu 3.16.0-16.22-generic 3.16.2 Uname: Linux 3.16.0-16-generic i686 ApportVersion: 2.14.7-0ubuntu2 Architecture: i386 Date: Fri Sep 19 17:09:17 2014 InstallCmdLine: file=/cdrom/preseed/xubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- debian-installer/language=de keyboard-configuration/layoutcode?=de InstallationDate: Installed on 2014-09-19 (0 days ago) InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Alpha i386 (20140919) ProcEnviron: TERM=linux PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: ubiquity UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/1371651/+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