bug#26688: LXDE: Login fails

[ng0]

At the moment trying to login through SLIM (same with SDDM) into LXDE
you get the message "Failed to execute login command" for
about 2 seconds, then the X session terminates and your are
back at SLIM.

Effectively through the login managers we have, LXDE is not
usable at the moment. I haven't tested using just "startx".

I open this bug so that it can be referenced and is visible. To me
it is known since I've sent in the meta package for LXDE.
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