I searched the Internet for instructions on how to remove GRUB, but the only thing I could find was using a Windows DVD to "repair" the system.
I previously had a Windows/Linux doal-boot and removed Windows (GParted + Boot-Repair), but GRUB is still installed with only one entry: the Linux one.
How can I uninstall GRUB and directly boot on a Debian-based OS?
While you can uninstall GRUB, that would mean you have to set up another bootloader and is probably not worth it. There is no reason to use another one since you just want the GRUB screen to be hidden. I believe that all of the other bootloaders work in similar ways, so you shouldn't worry about installing something else.
If what you want to do is hide GRUB. This is possible, and quite easy. Press Alt+F2 and paste this before hitting Enter: gksudo gedit /etc/default/grub.
A text-editor window will open, showing something like:
GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
#GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=”`lsb_release -i -s 2> /dev/null || echo Debian`”
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash”
GRUB_CMDLINE_LINUX=”"
Remove the two #s before GRUB_HIDDEN_TIMEOUT and GRUB_HIDDEN_TIMEOUT_QUIET. Save the file, open a terminal and run sudo update-grub. Reboot and you should have no GRUB window show up.
Also set GRUB_HIDDEN_TIMEOUT to 1 to avoid potential problems. GRUB will flash by, but it won't sit there for 10 seconds.
If you want, you can do this graphically.
Run these commands in a terminal window:
sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer
Once that's done, search for and open GRUB Customizer.
Go to the General tab and deselect show menu and look for other operating systems. Click the refresh button (blue circular arrow near the top right) and then click save.
(NOTE: GRUB Customizer does not seem to support EFI/GPT based systems.)
Reboot and see no bootloader.
Source: http://ubuntuhandbook.org/index.php/2014/06/ubuntu-1404-hide-grub-menu/
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