I am making installation for school computers. I would like to remove single user mode booting, which can make student root user. How to permanently remove single user / recovery mode from GRUB? I am also concerned with updating kernel (update-grub)
I DO need GRUB for booting into Windows installation.
Open a terminal with Ctrl+Alt+T shortcut and type this command and then hit Enter.
gksu gedit /etc/default/grub
The above command will open GRUB default file in gedit text editor. Search for a section like this one:
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
Remove the # mark from the line #GRUB_DISABLE_RECOVERY="true". The changed section should look like this:
# Uncomment to disable generation of recovery mode menu entries
GRUB_DISABLE_RECOVERY="true"
Save the file by pressing Ctrl+S, then exit gedit.
Then again going to the terminal, execute the below command:
sudo update-grub
Restart to see that the recovery option has gone.
