"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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1049549/+subscriptions
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