I have the same problem. I've installed Windows 10 with Secure Boot enabled, then I've installed Ubuntu 18.04.5 without Secure Boot, the menu was not displayed, I thought it was because of the Secure Boot, but...
My notebook (Dell Inspiron 5537) has a battery problem and displays a message asking to press F1 key to continue or F2 for settings. I removed the battery and the grub graphical menu was displayed without a problem. With the battery connected I had to use the `GRUB_TERMINAL=console` option to show the menu. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1863434 Title: 20.04 grub menu not visible To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1863434/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs