Sounds like the hd is corrupt ? Probably should test mounting into from the live usb.
It could certainly be a corrupt drive, or Mint could have silently installed an update that borked GRUB.
Stinkpads are funny things. They're like a Mercedes. They run awesome right up until they don't, then you're calling Germany for parts so you can be laughed at and told it's a 6 month wait if it's even available.
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