I am currently running 20.3 and was preparing to upgrade to 21 when this boot issue occurred. With my limited knowledge and with doing some research I see 2 possible paths:
1. Running the setup and at the Installation Type screen, select
Something Else
and installing onto the root partition leaving the rest of the disk intact. I believe this is the reason for separating /home from root for just these type of circumstances. I have downloaded a copy of a 20.3 image onto my Ventoy stick for this purpose.2. Restore from a Timeshift backup. I had Timeshift run a backup once a week so that I can recover in case something I install/change bricks my system. I've only had to restore once in the 3 years I've been running Linux. I believe I can run Timeshift from a live session but not sure if this is the correct usage of it.
I think option 1. is the way to go, but would like to pick a few brains to make sure I'm on the right track. Currently I am stuck with a W10 laptop and am greatly missing Linux. Below is an output of lsblk - sda2 is root and sda4 is /home. TIA.
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mint@mint:~$ lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
loop0 squashfs 0 100% /rofs
sda
├─sda1 vfat CBF9-C961
├─sda2 ext4 97f6b315-660f-47af-8049-5bf5fcb4286c
├─sda3 swap 25185f9e-0dc6-45aa-b092-a614925b629f [SWAP]
└─sda4 ext4 be6a4eab-e36d-40c2-8aae-c75c7ab5f8bc
sdb iso9660 Linux Mint 20 Cinnamon 64-bit 2020-06-24-19-01-47-00
├─sdb1 iso9660 Linux Mint 20 Cinnamon 64-bit 2020-06-24-19-01-47-00 0 100% /cdrom
├─sdb2 vfat 1AC3-20ED
└─sdb3 ext4 writable 72acd476-f593-4be7-a999-b1e0f32c0110 5.1G 1% /var/log
sr0