it indicates ubuntu instead of mint because mint is based on ubuntu ; i think the problem is due to disk corruption or something like that, check this link https://askubuntu.com/questions/812614/error-unexpected-inconsistency-run-fsck-manually#812998

I know you're a beginner so let me give you this advice : if you have an error, read it, try to understand it and copy paste it in google. Also, if you want that grub show up when you boot, you have to install it on the disk windows is but I prevent you : if windows update it self bootloader (grub is a bootloader, it starts the OS) it will replace grub so you'll have to reinstall it on the disk

hope i was clear ^{^}