Ubuntu natty with xbmc dharma won't shut down from menu

Solved this by editing /var/lib/polkit-1/localauthority/50-local.d/custom-actions.pkla

and replacing it with the following. Just make sure "xbmc", marked red, is the correct user...

[Actions for xbmc user]
Identity=unix-user:xbmc
Action=org.freedesktop.upower.*;org.freedesktop.consolekit.system.*;org.freedesktop.udisks.*
ResultAny=yes
ResultInactive=no
ResultActive=yes

Thanks to
http://wiki.xbmc.org/index.php?title=Ubuntu_Suspend_/_Wake

Solution: Flash drive identified as SDA during ubuntu install

Problem: My Gigabyte motherboard identified my USB Flash Drive as SDA, so it swapped place with my drive which appeared as SDB during install.

This is only a problem when it comes to the MBR installation, which will be installed to sda, nomather if you chose to install your system to sdb.

Fix?
Boot your system again, but remember to keep your usb drive inside the first time you boot. Then simply run this cmd:

sudo grub-install /dev/sda

Just make sure your linux drive this time is identified as sda :)