[Bug 769669] Re: Installer should not format an existing EFI SYSTEM PARTITION and should use FAT32 instead of FAT16 as the FS

[Roderick Smith]

Oh, one more thing: Windows is fussy about the ESP; if it's FAT16,
Windows won't accept it as a valid ESP (although it displays as one in
the partitioning screen), and will insist on creating a new FAT32 ESP.
It will then get confused and be unable to complete its own
installation. Thus, if you install Ubuntu first and then Windows to work
around this bug, Windows won't install properly unless you first back up
the ESP, create a new FAT32 filesystem on it, restore it, and fix your
/etc/fstab entries.

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https://bugs.launchpad.net/bugs/769669

Title:
  Installer should not format an existing EFI SYSTEM PARTITION and
  should use FAT32 instead of FAT16 as the FS

Status in “partman-efi” package in Ubuntu:
  New

Bug description:
  Binary package hint: partman-efi

  When selecting an EFI partition under parted during ubiquity install
  on 11.04, there is no option to select mount point.  As windows 7 had
  installed an EFI partition at /dev/sda1 formatted to NTFS, I selected
  that.  I did not select that it should format the mount point, but it
  did anyway to FAT16 and deleted the windows bootloader.  Update-grub
  does not find windows, and I had to go to great lengths to reinstall
  the bootloader to the same partition as windows, it is still missing
  from /dev/sda.

  I had expected that even if /dev/sda1 was formatted, it would at least
  preserve the existing bootloader instead of putting me in a position
  where I had to use a windows recovery disk for several hours until I
  can now at least boot to windows using the bios, but grub is still
  unaware of the windows install.  I expected windows to overwrite grub,
  but I didn't expect installing linux to break my windows install.

  I encountered this bug after having the problems in this bug:
  https://bugs.launchpad.net/bugs/765270.

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