A few generic tweaks I add to Ubuntu's configuration (location: /etc/default/grub) of the GNU GRand Unified Bootloader.
Make some noise
It is a good thing to start Linux with a bit of song ...
# Uncomment to get a beep at grub start ... how about 'Close Encounters'? GRUB_INIT_TUNE="480 900 2 1000 2 800 2 400 2 600 3"
On some devices I run into this issue: "Black screen instead of password prompt for boot encryption".
I have to blindly enter the passphrase for my LUKS-encrypted partitions and ALT+F1 to console. Trying to remove GRUB options splash and/or quiet results in the inability to enter the passphrase at all and a hard reset is required.
To fix, add ...
# Force the kernel to boot in normal text mode with '=text' GRUB_GFXPAYLOAD_LINUX=text
See: GNU gfxpayload