cannot log in with gdm after lenny upgrade

I just upgraded my etch to lenny, using aptitude. Several runs of
aptitude ofer a few days did it. Now the only package that it can't
install is postfix-doc, which I suspect I don't need to worry about.

I can log i as root on the alt-F! console just fine. That's when I mount
the NFS volume that contains my home directory.

But when I try to log in as an ordinary desktop user after gdm has been
started (no, not as root, as the ordinary user "hendrik" which worked
fine on etch before the upgrade, and still works fine when I boot my
backup etch system) it <i>immediately</i> informs me that my session
lasted less than 10 seconds, and when I ask to see the details it says:

(process:8822): Gtk-Warning **: This process is currently running setuid
or setgid
This is not a supported use of GTK+.
You must create a helper program instead. For further details, see:
http://www.gtk.org/setuid.html

Refusing to initialise GTK+

Then the same information for process 8826.

Then:

/etc/gdm/Xsession: Beginning session startup ...
Setting 1M through im-switch for locale=en_CA
Start IM through /farhome/hendrik/.xinput.d/en_CA linked to /etc/X11/xinit/xinput.d/uim_toolbar.
failed in listen(): INvalid argument
mkdtemp: private socket dir: Permission denied


Now I doubt this is because I haven't successfully installed postfix-doc.
It looks as if something is being started setuid/setgid which chouldn't
be, but I don't know what.
It further looks as if some necessary interprocess communication path is
not being set up correctly, but again I don't know what. Perhaps that is
related to the failure to set up the GTK+ environment. Perhaps something
else is going on.

The window manager I use is Icewm. But I have the same symptom with
several others. Perhaps it isn't even getting that far.

The kernel I used is 2.6.18-5-486

Any hints what to try? where to look?

-- hendrik


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