I installed 13.04 as a virtual machine using VirtualBox from Oracle. When it was done doing the install, it says that it needs a reboot. After the reboot, I got this message:
Sorry Ubuntu 13.04 has experienced an internal error /usr/bin/compiz
I'm not sure what it means and how to resolve it.
sudo apt-get update && sudo apt-get dist-upgrade
there. This may get bug fixed. – Takkat Sep 06 '13 at 08:08