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Fix pygrub booting of debian squeeze

Debian Squeeze is now using grub2 as the default bootmanager. Because of this pygrub has some difficulties to boot the domU after installing it. Here are the things i found out, if you have more remarks, drop me a comment please.


Direct mount xvda devices (or multi-partition isos)

Sometimes you will get in the need to directly mount an xvda device which is often used, if you (for example) install a debian virtual system in xen. Then this block device consists out of several partitions, which can not directly be used. But of course you can access the data of it, without the need of booting the guest os (domU).
This is the same if you get an iso or any other type block devices which uses multiple partion slices.