turn on grub menu

if your grub menu don’t show when you boot up your system , you can follow this :

edit grub config

sudo vim /etc/default/grub

# GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10

commit

sudo update-grub

get a theme

gnome grub themes store

deadsec theme

change some grub settings

edit grub config

sudo vim /etc/default/grub

find and change:

GRUB_DEFAULT=saved

add this line

GRUB_SAVEDEFAULT=true

this 2 line make grub rember your choice

commit

sudo update-grub