Have you tried another dm?  XDM or KDM for example?

Does it crash X or just return to a login prompt without restarting X?

Daniel.



On 29/03/15 13:46, Craig Sanders wrote:
> can anyone think of any reason why on one of my systems I can't login
> with lightdm? as soon as I do (with any account, including a brand new
> one without any weird/old/obsolete dotfiles), it seems to login OK but
> then logs out again immediately.
> 
> my normal desktop environment is xfce, but the same thing happens if i
> tell lightdm to use lxde or gnome or anything else.
> 
> logging in on a text VT and running startx works perfectly, and is how
> i've had to login for the last few months.
> 
> I have four other very similar systems where lightdm works without a
> problem, including a mythtv box set to auto-login as the mythtv user.
> two of them are sysvinit, two of them are systemd.
> 
> i can't see anything in the logs to indicate any problem, even the
> auth.log just shows that the session was started and then the session
> terminated immediately afterwards. any hints on what to look for in
> the logs or where/how to increase debug log levels would also be
> appreciated.
> 
> craig
> 
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