Bug#253040: gnome wont start up if isdnutils is running

[p.richardson@bruxellesformation.be, 253040@bugs.debian.org]

> I have the same problem with my USB ADSL speedtouch modem.
> If it is running, the gnome-session is freezed on the splash screen.
> If I disconnect it, all seems all right ?

I have for my case found the solution. In fact my Sarge installation was
new and the trouble was that I had no network loopback device (lo) in the
networking configuration. After putting it in place gnome started well
even with my modem in use.
Hope that it will help.