Recently I upgraded from ubuntu 16.04 to 18.04. But due to some unknown reason I started to receive this warning message before my grub2 menu shows up.

Simulated Output generated with grub-emu

I have no problem converting /etc/default/grub to the executable file with update-grub, and grub-script-check reports no error.

Anyone has any clue what is causing the problem here?

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