Thanks for the output. The good news is, it does not look like a failing hard drive.
If you are able, I would highly recommend backing up all personal files. Check their integrity on the drive you save them to.
Once done, boot into the Recovery Menu of Zorin OS:
Select the fsck option and run it.
When prompted, say "Yes."
Yes, reinstalling Zorin OS is an option and is a good option if you are comfortable with doing so.