Public bug reported:
We assign hostnames to machines using dhcp. For this to work in 12.04
you seem to have to remove /etc/hostname (or have it empty, the
behaviour is the same). However doing this results in the first
attempted graphical login after boot failing. I have reproduced this
behaviour across several machines, from upgrades and clean
installations, and can turn it on and off by removing /etc/hostname, or
making it non-empty.
The symptoms are:
- At the greeter prompt the hostname at screen top left is set to localhost
- If I switch to a console prompt the hostname displays correctly (i.e. not
localhost)
- After successfully entering a uname/pwd you briefly get a desktop for one
second or so, then it drops to the console for half a sec or so, then the
greeter re-appears.
- Once the greeter re-appears the hostname will be set correctly at screen top
left, and subsequents logins successfully proceed to the desktop
.x-session-errors has some lines about xrdb being unable to open
display:0, other logs in /var/log/lightdm/ seem ok, but I'll include
them too. I've run strace -ff -p <lightdm> but am not familiar enough
with the graphical login process to make much headway there, and I've
yet to turn up an obvious - to me - error, though paging through strace
output tends to make ones eyes glaze over :)
Curiously I can't replicate this in a VBox VM. Fresh install, exact
same configuration but it displays the hostname properly at screen top
left and the first login proceeds normally. I will make the VM name and
dhcp hostname different and see if this reveals the bug.
Regards
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1007221
Title:
Removing /etc/hostname results in failed first login attempt
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