[Bug 1017880] Re: Windows7 EFI not detected by os-prober

[Evertjan Garretsen]

Also see meta-bug Bug #1037351

Could not install Ubuntu for the installer did not see my windows
installation and existing gpt partitions. It wanted to install on the
full hard drive space! By doing so, i would have destroyed both my
windows installation and recovery partition! This is very serious for
inexperienced users! I had to find a way to let the installer see
windows. After a lot of searching forums i found a (not ideal) solution:
Removing the recovery partition of windows. Apparantly the last X blocks
of a hard drive should be available for Ubuntu to see windows installed.
After i removed the recovery partition, in the windows partitioner,
Ubuntu installed just fine on a partition i wanted to use.

Please also add to 'Installer design' documentation. There should be a
double check (or a working check) to see if another OS is already
installated, otherwise this could lead to data-loss for inexperienced or
unconcentrated users.

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https://bugs.launchpad.net/bugs/1017880

Title:
  Windows7 EFI not detected by os-prober

Status in “os-prober” package in Ubuntu:
  Confirmed

Bug description:
  PC with pre-installed Windows7 , GPT disk , EFI boot.

  os-prober does not detect Windows, as seen here:
  http://paste.ubuntu.com/1057933

  
  Bug initially reported here: http://askubuntu.com/questions/155492/why-cannot-ubuntu-12-04-detect-windows-7-dual-boot/156167#156167

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