Only show GRUB when requested
Can the GRUB be set to operate like Os X, where by it only shows when specifically requested by a start up key or command before retart?
Solution 1:
Holding down SHIFT after your bios logo appears makes grub menu appear if it's hidden. To make it hidden you need to edit /etc/default/grub with your favourite editor and add the following or remove the # if already exists
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
save and quit, then run
sudo update-grub
(thanks for the reminder +forespiskie)