Thank you Paddy! The troubleshooting guide worked perfectly! You are a lifesaver!
Yes, I am using Ubuntu 18.04. The issue arose when I tried to restore a backup done with Timeshift.
NB: As for newer versions of Ubuntu I did try your guide on 19.10 but it didn't work for me.
A question - isn't grub located on /boot and /boot is encrypted - so how does it work prior to me entering the password? Or is there another grub on /efi and that's the grub that I refreshed following your troubleshooting guide?
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