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@yuki2501 (going to sleep now though, it's past 3am here. goo luck!)

@yuki2501 but yeah as the other reply said, you can also mount hte root partition from kubuntu 19, chroot to it, mount the other partitions of that system inside the chroot, and then run grub-update

@yuki2501 this would sidestep the entire "what does grub think my root drive is" issue

@yuki2501 no, I was trying to tell you to edit the files that reside in your boot parittion and normally get generated by grub-update, so you can boot in your regular install instead to then do the fixing & running grub-update again

@yuki2501 alternatively, with the 'e' key you can edit a grub boot option so you can do a one-time edit to make it boot maybe?

@yuki2501 yes, connect the drive onto kubuntu 19 machine, mount its /boot partition somewhere, and edit the grub config there manually so you can boot your regular linux install

@yuki2501 temporarily manually edit the grub config in your root partition to do the proper thing on your actual daily driver computer (whle booted into kubuntu 19), then boot into the normal install on your daily driver machine, and re-regenerate the grub config from there?