this post was submitted on 15 Mar 2026
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Well in my case, using systemd-boot:
Window's default EFI partition was too small to hold the kernel, but CachyOS setup didn't check for this and just failed to boot linux. You wouldn't run into this issue on a second disk I suppose, but I did on a single NVMe shared with Windows.
Sometimes, if you do share an EFI partition between Windows/Linux, Windows Update will randomly nuke it and break your linux install.
I also had an instance where systemd-boot just stopped detecting Windows after awhile, and it needed some manual fixing.
Basically, trying to install linux on the default EFI partition next to Windows is a risky default, and Windows users new to linux aren't going to know anything about how to fix it.
The fix is to just make a second EFI partition on the drive, but the installer doesn't do this by default. And I encountered this a long time ago, but noticed the issue was still present when testing Cachy on another PC, by chance.