Comment 4 for bug 457858

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Mario Limonciello (superm1) wrote : Re: ubiquity-dm crashed with XStartupError in run()

I'm fairly confident this is caused by a race condition between the ubiquity upstart script and the ubiquity-noupstart init script (which are both available and activated).

I've been able to prevent this from happening by either of these two scenarios:
--1--
1) boot with "break=bottom" in /proc/cmdline
2) At the initramfs prompt: "rm /root/etc/rc*.d/*ubiquity-noupstart"
3) exit

--2--
1) Unpack the initrd.lz
2) Modify one of the scripts in scripts/casper-bottom (pick one)
3) Add this line:
"chroot /root update-rc.d -f ubiquity-noupstart remove"
4) Repack the initrd