this post was submitted on 04 Jun 2025
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I've been dualbooting for over a year now. Made sure each system has its own separate drive. I've noticed that every time I had to reinstall Linux, my windows boot entry is gone and then I can't access it no matter what I tried. Turned out installing Linux first then windows was my mistake. When installing windows while there is a Linux install, windows will see the EFI partition already there and just decides to share it, and doesn't create its own.
I found that out by accident while I was in windows' storage management. There was no efi partition. Took a whole day to find out how to create one on the same drive where windows is installed and removing the one it created on the Linux partition. It was so painful.
Bottomline, install windows first if you want to dualboot. After that, even if windows takes over the boot after an update, all it does is resets the boot sequence and makes it default to it. You'd just need to access the bios and reset the sequence to prioritize Linux. That's it
That's what it's supposed to do, it's a plain FAT32 partition, the bootloaders are just files you put in there.
Part of the issue is that while a well-made motherboard will look for all bootloaders on the partition and present them as options in the firmware UI, bad ones will only look for a specific file (
\EFI\BOOT\BOOTX64.EFI) and use that. For an OS to have a chance of booting on those boards it has to overwrite that file, blowing away whatever other bootloader was there before.It's annoying, since Windows is mostly well behaved here (It puts the main copy of the bootloader at
\EFI\Microsoft\Boot\bootmgfw.efiand Linux bootloaders can see that and offer it, the reverse isn't true) and can co-exist with Linux well (Well...), but manufacturers cutting corners causes more problems for everybody.The
\EFI\BOOT\BOOTX64.EFIis the only file the UEFI standard says it is required automatically lookup from an EFI system partition. There can many EFI partitions but the UEFI is only required to find a single file per such a partition.efibootmgr -ucan show all bios auto created boot entries (don't touch those, the bios can/will reset them at whim) and the manually created entries that don't launch a BOOTX64.EFI named file.