Thanks. Secure boot was on, RAID wasn't enabled. I can't recall legacy/UEFI boot mode, but I've done a fresh reinstall now anyway.
@IrPOWERranger started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Thanks.
Secure boot was on, RAID wasn't enabled.
I can't recall legacy/UEFI boot mode, but I've done a fresh reinstall now anyway.