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

[YannUbuntu]

"if I have /dev/sda /dev/sda1 /dev/sda2 /dev/sda3 and my /boot is on
/dev/sda2 and fedora on /dev/sda1 & ubuntu on /dev/sda3, it actually
does makes sense to install grub-pc stage1 bootcode into /dev/sda."
---> exactly.

"Well it is recommended by grub upstream to install stage1 onto /dev/sda
and not the partitions e.g. /dev/sda3" ---> I know.

"If Windows is installed onto /dev/sda1 you are saying it is potentially
harmful to install grub into /dev/sda1 or /dev/sda? "  -----> sda1 only.
And this is not "potential" but SYSTEMATIC.


** Description changed:

  The "Something else" option (= manual partitioning screen) allows the user to change the location where GRUB 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 are useless and SHOULD be removed:
- - all partitions except the partition containing /boot
  
  The following entries break Windows boot and MUST be removed:
- - all partitions containing Windows boot files (bootmgr, ntldr, EFI partitions)
+ - 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.

** Summary changed:

- Ubiquity manual partitioning offers to install grub in a way that may break Windows boot
+ Ubiquity manual partitioning offers to install grub in a way that breaks Windows boot

** Description changed:

- The "Something else" option (= manual partitioning screen) allows the user to change the location where GRUB will be installed.
+ 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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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:
  New

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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