I’d say Live-CD/USB and use the recovery mode to fix GRUB. Grub has to appear so thet’s the first issue. If you’re lucky it’s the only one and you can skip the more complicated steps.
I would also suggest, if you get grub back, to choose the 2nd kernel version in the list. The latest/top one will probably put you back to your broken state.
I’d say Live-CD/USB and use the recovery mode to fix GRUB. Grub has to appear so thet’s the first issue. If you’re lucky it’s the only one and you can skip the more complicated steps.
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https://www.system-rescue.org/disk-partitioning/Repairing-a-damaged-Grub/
I would also suggest, if you get grub back, to choose the 2nd kernel version in the list. The latest/top one will probably put you back to your broken state.