Does it ever "recover" from the black screen? Note it may take a minute or two, but it should finally go away.
Can you clear /var/crash/* and try again, see if there's a .crash file of unity8 in there after logging out? ** Changed in: unity8 (Ubuntu) Status: New => Incomplete ** Changed in: canonical-devices-system-image Status: New => Incomplete -- 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/1618988 Title: unity8 goes to black screen 'n freeze after logout attempt Status in Canonical System Image: Incomplete Status in unity8 package in Ubuntu: Incomplete Bug description: as in subject header ... when logging out of unity8 it will go to blackspace and freeze. ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: unity8 8.14+16.10.20160826-0ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-25.44-generic 4.4.13 Uname: Linux 4.4.0-25-generic x86_64 ApportVersion: 2.20.3-0ubuntu7 Architecture: amd64 CurrentDesktop: Unity Date: Wed Aug 31 13:09:15 2016 InstallationDate: Installed on 2016-08-31 (0 days ago) InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160616) SourcePackage: unity8 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1618988/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp