Johannes Weiss wrote:
> For me, the problem appeared first after an update to ubuntu 8.10 (from 8.04) 
> and then once more when 
> updating to xubuntu 8.10 (from 7.10).
>
> The problem was that the hostname has been set to
> 'localhost.localdomain' while booting (NetworkManager did it, because it
> could not determine a better one, because config was not ok) and then
> changed to the real hostname (configured in /etc/hostname) when I
> connected to a WLAN. Xorg doen't like hostname changes while running,
> the consequence is: No more new xclients! (xauth denies it)
>
> That did the trick for me:
>
> - log out from xorg
> - go to a console ([Ctrl]+[Alt]+[F1]) and login
> - enter:
> sudo killall NetworkManager
> - enter:
> sudo tee /etc/network/interfaces <<EOF
> auto lo
> iface lo inet loopback
> EOF
> - enter:
> sudo tee /etc/NetworkManager/nm-system-settings.conf <<EOF
> [main]
> plugins=ifupdown,keyfile
>
> [ifupdown]
> managed=false
> EOF
> - edit your /etc/hosts and change all entries starting with 127.0.*.1 
> (replace YOURHOSTNAME with the hostname configured in /etc/hostname) to
> 127.0.0.1 YOURHOSTNAME YOURHOSTNAME.local localhost localhost.localdomain
> 127.0.1.1 YOURHOSTNAME YOURHOSTNAME.local localhost localhost.localdomain
> - reboot (sudo reboot)
>
>   

is nm-system-settings running?

-- 
NetworkManager changes hostname to *.private
https://bugs.launchpad.net/bugs/204824
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