by gohlip » Jan 10th, '18, 11:42
Generally speaking, it is best not to mix gpt and msdos disks.
Also do not mix uefi and bios-legacy.
Again generally, if gpt use uefi
and if msdos, use bios-legacy.
A uefi grub cannot boot bios-legacy windows
and a bios-legacy grub cannot boot uefi windows.
So if you want to keep an existing windows, use same setup as the windows system.
To install in uefi, install media must be booted up in uefi
To install in bios-legacy, the install media must be booted up in bios-legacy.
Some exceptions - One exception -
A gpt disk can be installed in bios-legacy with a bios_grub partition and flagged as such.
Only reason to do this is when the disk exceeds 2TB as msdos disks cannot handle > 2TB and the system is only bios-legacy.
Why do we live? To prove not everything in nature has a purpose.