update after wubi install makes linux fail

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http://www.linuxforums.org – so while converting a few friends i have done a few wubi installs, but after the install, it wants to update. if i let it update, it fails to load up.... has happened on two different computers both with win7. when wubi installs it, it has no grub, but after the update grub is loaded after the windows bootloader and just sits there. advice anyone? should i turn the updates off or just do a real dual boot? (HowTos)