[Bug 1049549] Re: Ubiquity manual partitioning offers to install grub in a way that breaks Windows boot

[Fred Palmer]

We still see this. I see about one user a week having this issue and I
have to have them use testdisk to restore backup or use Windows repairs
to fix.

It seems to be in several different places. Original install under
Something Else or dpgk reinstall of grub. But in all cases it seems that
partitions with essential boot code already in them are offered as
choices for grub2 to install into.

Supposed fixed long time ago?
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/576724

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https://bugs.launchpad.net/bugs/1049549

Title:
  Ubiquity manual partitioning offers to install grub in a way that
  breaks Windows boot

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  The "Something else" option (= manual partitioning screen) allows the user to change the location where GRUB stage1 will be installed.
  ("Device for bootloader installation" combobox).
  AFAIK, the default entry in this combobox is /dev/sda. Currently the combobox also allows to select any partition (eg /dev/sda1 , /dev/sda2...)

  The following entries break Windows boot and MUST be removed:
  - all partitions (eg /dev/sda1 , /dev/sda2...) containing Windows boot files (bootmgr, ntldr). In other words, all partitions detected as "Windows" by os-prober.

  Probably the problem is the same with systems other than Windows, so I
  recommend to remove all partitions detected by os-prober.

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