That didn't help at all, this package caused even more troubles and
lightdm service failed to start.
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https://bugs.launchpad.net/bugs/1410406
Title:
black screen after booting, 100% cpu
I can confirm this error in Xubuntu 15.04. The error is in deed fixed by
installing updates. However the issue appears again with multiple monitors.
If you click anywhere the login window will be displayed. This issue is fixed
by inserting
active-monitor=0 on the end of file /etc/lightdm/lightd
