Black screen after login, no mouse

[briannawhite]

After updating Ubuntu 14.04 LTS on my Dell laptop, I get a black screen with no mouse after login. The guest account half works (I can login and get the orange ubuntu background, but no other icons. Admittedly, it might not be a lightdm issue. I've tried stoping and restarting lightdm, but to no avail. Also set the default display manager via sudo dpkg-reconfigure lightdm, also didn't help

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.3-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
Date: Sat Dec 27 17:19:15 2014
InstallationDate: Installed on 2014-12-25 (2 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)