Assert all file system changes are committed
Use pypi Command and simplify up the command run handling
Fix a udev / grub problem
See https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/604335
      https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/565146
      http://lists.opensuse.org/opensuse-bugs/2012-04/msg00301.html