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How to update GRUB from a live CD?

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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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Joined
Feb 18, 2010
Messages
1,850 (0.36/day)
System Name Eldritch
Processor AMD Ryzen 5 5800X3D
Motherboard ASUS TUF X570 Pro Wifi
Cooling Satan's butthole after going to Taco Bell
Memory 64 GB G.Skill TridentZ
Video Card(s) Vega 56
Storage 6*8TB Western Digital Blues in RAID 6, 2*512 GB Samsung 960 Pros
Display(s) Acer CB281HK
Case Phanteks Enthoo Pro PH-ES614P_BK
Audio Device(s) ASUS Xonar DX
Power Supply EVGA Supernova 750 G2
Mouse Razer Viper 8K
Software Debian Bullseye
Thanks, I'll try it out tomorrow.
 
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