How about /var/log/lightdm/unity-system-compositor.log ?
You will get some nice detailed log info from Mir there.
** Changed in: mir
Status: Incomplete => New
** Changed in: unity8 (Ubuntu)
Status: Incomplete => New
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1543133
Title:
Desktop: Black screen after logging into unity8 session
Status in Mir:
New
Status in unity8 package in Ubuntu:
New
Bug description:
On xenial amd64 desktop after logging into the unity8 session, I'm
greeted by a black screen, no mouse cursor, nothing. Only Magic SysRq
gets me out of the session.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity8 8.11+16.04.20160129-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
Uname: Linux 4.4.0-2-generic x86_64
ApportVersion: 2.19.4-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Feb 8 15:07:17 2016
InstallationDate: Installed on 2015-04-30 (283 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: unity8
SystemImageInfo: Error: command ['system-image-cli', '-i'] failed with exit
code 2:
UpgradeStatus: No upgrade log present (probably fresh install)
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