Removing grub entries.

Removing grub entries.

grub stores the entries in the files under /etc/grub.d

we can remove or add files under this location to add or delete entries that appear in grub.

e.g.   If we wanted to remove all of the memtest86+ entries, we could just make the 20_memtest86+ file non-executable, with the terminal command

How to change grub settings.

edit /etc/default/grub, need root privileges to edit it.

Use terminal, then 

sudo nano /etc/default/grub

and run sudo update-grub to make the changes permanent!