I have several older dual-boot systems. The other OS is irrelevant to this question. I use MBR system drives, because EFI is a nuisance when I want to boot from CD or USB. On one machine, I had 20.04.05 and let updater upgrade it to 22.04. After a few updates, the updater’s package system became hopelessly broken, so I decided to reinstall 22.04.1 from a thumb drive.
I selected “something else”, and selected the existing Ubuntu partition as mount puint “/”. I ignored the EFI warnings because I do not want EFI. Install crashed trying to stuff EFI onto the drive. After that, the system drive was unbootable (Grub rescue mode*), and had to be reimaged from backup. Same result if I select automatic overlay of the existing Ubuntu partition
I ended up installing 20.04.5 for now. Drilling through the EFI warning wipes my Grub customization, but it does boot MBR, so I can fix Grub easily.
Is there a way to stifle forced EFI and respect my existing MBR/Grub setup when installing 22.04.1?
*The solution may lie here, but I have no idea how to proceed.
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