since about a month (I guess, sorry) I get sometimes (not always) when booting, prior to the grub menu a blue screen saying “shim uefi key management”.
This gives me options to boot, or to load a key or a hash.
I don’t know what triggered it in the first place, i don’t know why it doesn’t show up on every boot, and I don’t know what it’s about…
My PC has an Asus prime B250M-A motherboard, I run TW from a SSD, and I haven’t made any changes in ‘BIOS’- or boot configuration.
Since I’m completely unfamiliar with this, I don’t know what more info to provide.
When googling for this topic I found several postings by people saying they were locked out of their Fedora/ubuntu install, with apparently no option but to reinstall.
So far I can boot, but I don’t hope this is an early warning for upcoming problems.
Does anybody recognize this, and can explain in simple wordings what it is, and what I have to do to loose this blue screen before it gets dangerous?