It seems that latest X in potato has removed the support for
/etc/X11/window-managers in Xsession.
So how does one start fvwm95 automatically from xdm ??
In documentation I found just the removal mentioned,
but no alternative:
* debian/xfree86-common/Xsession:
- remove support for /etc/X11/window-managers; virtually every window
manager has migrated to the new alternatives method (Closes: #58224)
-Igor Mozetic