Ubuntu
grub2 package

  1. Bug #1955109
  2. Comment #5

Comment 5 for bug 1955109

Revision history for this message
ajgreeny (ajg-charlbury) wrote : Re: boot menu not appearing after manual install of jellyfish daily build

I noticed this problem yesterday, 16 December 2021, but it is easy enough to overcome with an additional line added to /etc/default/grub
GRUB_DISABLE_OS_PROBER=false

There are other methods as well, adding the boot stanza of a missing OS to /etc/grub.d/40_custom file.

You need to update grub after either edit with
sudo update-grub