sounds more like lightdm fails to start, check it's logs in
/var/log/lightdm.
** Package changed: xdm (Ubuntu) => lightdm (Ubuntu)
** Changed in: lightdm (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/958805
Title:
LightDM has issues restarting when xdm is installed
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