[Merge] lp:~psusi/ubuntu/vivid/grub-installer/fix-efi-multi-disk-installs into lp:ubuntu/grub-installer

[Mathieu Trudel-Lapierre]

Review: Needs Fixing

There's a comment further down that explicitly mentions avoiding touching the active flag on GPT, so in that sense your changes look fine, but it seems the code that actually did ignore GPT from grub-installer itself went away, and now that is only checked in ensure-active itself -- could you move that comment and reword it so that the intent of the change is clear?

Something like "doing this because we won't set partitions active on GPT, and if $bootdisk points to a drive with no partition table things will explode in fun ways"... In your own words ;)
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https://code.launchpad.net/~psusi/ubuntu/vivid/grub-installer/fix-efi-multi-disk-installs/+merge/247772
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