Yesterday, I have reinstalled Ubuntu due to a error: hd0 out of disk on boot. Everything went fine, I've installed apps, perform updates and upgraded the kernel. I've even restarted it a few times just to check if I would encounter boot issues and was glad that everything was working perfectly, then powered it down.

The next morning when I boot, I got this error: hd0 out of disk error. Press any key to continue... again!

After pressing a key, it took 10 minutes for the Ubuntu logo to appear with it's 5 dots. After another 5 minutes, Ubuntu started checking the disk and displayed a message that / has errors, I pressed F to fix the errors. After which Ubuntu tells me that /tmp is not yet ready for mounting so I pressed S to skip mounting it, then Ubuntu restarted.

On boot I saw the error: hd0 out of disk error. Press any key to continue... again. This time it took only a minute for the Ubuntu logo to appear and after another minute a dialog box appeared with the following message:

The system is running in low-graphics mode. Your screen, graphics card,
and input settings could not be detected correctly.
You will have to configure these yourself.

What would you like to do?
Run in low-graphics mode for just one session
Reconfigure graphics
Troubleshoot the error
Exit to console login

Whichever option I choose I ended up with a console prompt:

grub-editenv: error: cannot read the file /boot/grub/grubenv.
_

I can't do anything on this console, whatever I type nothing happens. I've rebooted several times and I get same error every time.

I don't quite understand what is wrong with Ubuntu or with my installation. I've encountered this hd0 out of disk error several times already and always ended up reinstalling.

I'd really really appreciate it if you guys can help me fix this. Thank you and good day.