I have same problem on vivid:
unity8 in lxc black screen with cursor on Vivid
I added the unity8-lxc PPA
('http://ppa.launchpad.net/unity8-desktop-session-team/unity8-preview-lxc/ubuntu
vivid main'),
installed unity8-lxc and then used `sudo unity8-lxc-setup` and `sudo
unity8-lxc-setup --rebuild-all`
... black screen with mouse arrow ... power off to reboot.
sudo unity8-lxc-setup --update-lxc ... failed with errors like in
https://bugs.launchpad.net/ubuntu/+source/unity8-lxc/+bug/1418671
sudo -i
and
unity8-lxc-setup --update-lxc
completed ok
after reboot on LightDM I selected unity8 in lxc, entered password ... black
screen with mouse arrow.
the arrow follows the mouse, but I was unable to do anything.
CTRL+F1 has no effect, power off to reboot.
According suggestion in
https://bugs.launchpad.net/ubuntu/+source/unity8-desktop-session/+bug/1320356
I attach some logs created at logon with unity 8 in lxc in: /var/log/lightdm/
** Attachment added: "lightdm.tar.gz"
https://bugs.launchpad.net/unity8-preview-lxc/+bug/1437900/+attachment/4391010/+files/lightdm.tar.gz
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https://bugs.launchpad.net/bugs/1437900
Title:
Black screen with cursor on Trusty hosts
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