It seems that you have to run gnome-ppp as root.
Right click on Applications in the Gnome panel. Select Edit Menus -
Internet - Gnome PPP - Properties - Command: gksudo gnome-ppp
Hope this helps.
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gnome-ppp setup interface does not save data
https://bugs.launchpad.net/bugs/342760
You
I got the exact same problem installing Openbox and also installing
Xfce4. It seems that from gdm I can only start a GNOME session.
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Can not log into openbox from GDM in Karmic Beta/RC
https://bugs.launchpad.net/bugs/459005
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