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Grub2 Config Recipes
- comment out GRUB_HIDDEN_*
- run update-grub
- /etc/defaults/grub
...
#GRUB_HIDDEN_TIMEOUT=0
#GRUB_HIDDEN_TIMEOUT_QUIET=true
...
Add entry to /etc/grub.d/40_custom
run update-grub
Add Default Kernel options
update GRUB_CMDLINE_LINUX_DEFAULT= in /etc/defaults/grub
run update-grub