I installed Kubuntu 22.04 (after a failed upgrade from Kubuntu 20.04). A week or so later, my motherboard failed; after getting a refurbished/tested motherboard from China (obsolete hardware...) and installing it, I can't get a GRUB menu on startup, either in Legacy or UEFI boot mode. My old motherboard gave slightly different versions of GRUB in either mode.
I have a Boot Repair live USB, but after how it mangled things during my Kubuntu install a few weeks ago, I'm afraid to try running it again. Is there a practical way to reinstall and update GRUB from within Kubuntu or the command line, without the cryptic, easy-to-misunderstand or -misapply process of the Boot Repair live USB? I've tried reinstalling grub-efi-amd64-signed and its dependencies, along with shim-signed (they were being held by Synaptic, but I got them to reinstall from CLI apt) -- but no change.
At present, I have my UEFI/BIOS settings to start in Legacy-only mode, but I've tried UEFI-only, and both in both orders without change.
System: AMD FX8350 (8 cores/8 threads, 4.1 GHz max), 32 GB DDR3-1600, nVidia GTx 1070/4 GB in x16 slot, Gigabyte GA-970A-D3P
I have a Boot Repair live USB, but after how it mangled things during my Kubuntu install a few weeks ago, I'm afraid to try running it again. Is there a practical way to reinstall and update GRUB from within Kubuntu or the command line, without the cryptic, easy-to-misunderstand or -misapply process of the Boot Repair live USB? I've tried reinstalling grub-efi-amd64-signed and its dependencies, along with shim-signed (they were being held by Synaptic, but I got them to reinstall from CLI apt) -- but no change.
At present, I have my UEFI/BIOS settings to start in Legacy-only mode, but I've tried UEFI-only, and both in both orders without change.
System: AMD FX8350 (8 cores/8 threads, 4.1 GHz max), 32 GB DDR3-1600, nVidia GTx 1070/4 GB in x16 slot, Gigabyte GA-970A-D3P
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