Password reset- remount command not working

I set up my PC with Zorin OS 18.1, have been so busy I haven't touched it for 3 months and I can't remember my password. I've tried the method of going into recovery mode but when I type

"mount -o rw, remount /"
I get "mount: /: special device remount does not exist."

Please help! I'm super new to this stuff and this is beyond my understanding.

Nevermind, I figured it out.

For anyone with the same problem, I just played around with the spaces and stuff until eventually "mount -o rw,remount /" worked.

Then did the passwd "my_username" and reset my password and rebooted and all is well.

You're not using your command. The proper syntax for Zorin OS recovery is mount -o remount,rw /, without a space after the comma.

However, if it still indicates that the device doesn't exist, you're most likely not on the true root filesystem yet. Therefore, before using passwd username to change your password, run lsblk and remount the appropriate partition using mount -o remount,rw /dev/sdXY /.

I marked post#2 with corrected command as Solution.

I covered all three possible solutions in the Unofficial Manuals for 15, 17 and 18 under 'The Login Loop':