Issue starting with Windows 10 after setting up Ubuntu on another hard drive...
Issue starting with Windows 10 after setting up Ubuntu on another hard drive...
I'm facing an unusual setup here. I replaced my Windows 10 SSD with a separate hard drive and added an Ubuntu 22.04.2 LTS installation. After swapping everything back, Windows 10 won't start in UEFI with Secure Boot, yet I still see a boot menu labeled Ubuntu. I can only boot into Windows 10 using UEFI mode with legacy support. The BIOS shows both Secure Boot and non-Secure Boot modes, but the laptop doesn’t respond when I try to boot through the latter. Windows Boot Manager appears in both Secure Boot and legacy modes, yet the system remains unresponsive. I haven't used the Startup Repair tool, and I'm considering a BIOS reflash, which would likely require reinstalling Ubuntu later.
I attempted a startup repair which indicated "Windows failed to repair the problem." It then flashed the BIOS, and now secure boot functions in Windows are operational. I still don’t grasp why Ubuntu appears as a boot choice even though the Ubuntu drive isn’t connected, or why Windows couldn’t start initially using UEFI.
I thought updating the BIOS would also erase that data. Yet even after re-flashing, the Ubuntu boot menu remains accessible. On the other hand, once the BIOS is refreshed again, Windows 10 boots normally with Secure Boot enabled. So I won’t keep worrying about this... It seems the issue might be related to a Dell laptop—this one is old (third generation core), essentially at the end of the transition from Legacy to UEFI BIOS. I recall it originally came with a Legacy BIOS from the factory.