Public bug reported:
Somehow `/var/run/gdm` had the permissions changed to `711`. This causes
the greeter to fail, and shows a low-res screen with no Dash. `sudo
chmod 755 /run/gdm /run/gdm/greeter` fixed the problem for me, see
http://askubuntu.com/questions/596046/sudo-startx-works-but-startx-
gives-low-res-screen-no-dash/596047
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gdm 3.10.0.1-0ubuntu3.1
ProcVersionSignature: Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13
Uname: Linux 3.13.0-45-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar 12 13:32:21 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-01-23 (777 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
SourcePackage: gdm
UpgradeStatus: Upgraded to trusty on 2014-08-22 (202 days ago)
** Affects: gdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1431487
Title:
`sudo startx` works, `startx` give low-res, no Dash
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