Comment 14 for bug 222126

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Chadversary (chadversary) wrote : MBR Partition Table is cleared during install

If any bug is to be marked critical, it is the failure of the OS to boot.
The Ubuntu installation erased the MBR table, then when attempting to boot Ubuntu GRUB gave the error "no bootable devices". In order to get things working again, I had to sync the MBR table to the GPT using rEFIt, then reinstall GRUB manually.