Problem apparently solved. I just moved $HOME/.config/xfce4 directory to
another location and restarted xfce without rebooting.
Now, as you can see, .xession-errors has only a few lines after the
startup. I'm changing its status to invalid.
$ tail -f .xsession-errors
/etc/gdm/Xsession: Beginning
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/36909776/Dependencies.txt
--
xfwm4 flooding .xsession-errors on start
https://bugs.launchpad.net/bugs/497817
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ub
