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How to update GRUB from a live CD?

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#1
AKA I borked my grub.cfg so Mint is no longer on it. I've tried to chroot from a live CD but it keeps giving me BS (even after I read a guide about how to do it properly), so I can't just grub-mkconfig like what would make sense.

I'm currently trying to mount my hard drive to make chrooting easier, but it keeps telling me that it can't find sdb1 in /etc/fstab or /etc/mtab.
 
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DIBL

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#2
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System Name Eldritch
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Memory 16 GB G.Skill Flare X
Video Card(s) nVidia (Gigabyte) GT 740 2GB
Storage 80 GB IBM, 2 TB WD Green
Display(s) Dell 2007WFP
Software Debian Buster
#3
Thanks, I'll try it out tomorrow.