After bisecting the dist-upgrade, apt-mark holding various packages until I found the culprit.
It's either xserver-common, xserver-xorg-core, or xvfb (probably not the latter). If I unhold the first two and dist-upgrade, I see the freeze. ** Also affects: xorg-server (Ubuntu) Importance: Undecided Status: New ** No longer affects: lightdm (Ubuntu) ** Changed in: xorg-server (Ubuntu) Importance: Undecided => Critical -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1462398 Title: wily boot is completely frozen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1462398/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp