Boot hanging before login appears - how to fix?

[Chris Green]

My xubuntu 12.10 system isn't booting into the GUI, it stops before the
login appears.

The end of dmesg shows:-

    [   21.752962] postgres (1328): /proc/1328/oom_adj is deprecated, please use /proc/1328/oom_score_adj instead.
    [   27.395280] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
    [   27.405792] NFSD: starting 90-second grace period
    [   27.423795] init: lightdm main process (1271) terminated with status 1
    [   28.661917] vboxdrv: Found 4 processor cores.
    [   28.662377] vboxdrv: fAsync=0 offMin=0x278 offMax=0x1668
    [   28.662934] vboxdrv: TSC mode is 'synchronous', kernel timer mode is 'normal'.
    [   28.662936] vboxdrv: Successfully loaded version 4.2.10 (interface 0x001a0004).
    [   28.870273] vboxpci: IOMMU not found (not registered)
    [   30.000911] init: plymouth-stop pre-start process (2122) terminated with status 1

So what's killing lightdm?  It was working OK and I didn't change
anything that I know of that would affect this.  I can run startx from
the command line in one of the CTRL/ALT/n consoles and the GUI starts OK
so it would seem that it's just lightdm/the login that's having
problems.


-- 
Chris Green