Ubuntu
grub2 package

  1. Bug #1863434
  2. Comment #66

Comment 66 for bug 1863434

Revision history for this message
abssorb (abssorb) wrote :

Repeatable on dual-boot. The expected behaviour for dual-boot is that the grub menu will show.

Whatever process detects dual-boot during reconfiguration of grub is failing as of 20.04.1
grub-mkconfig ??

This also occurs when using boot-repair, if boot-repair performs a reinstall of grub, then the new config follows the single boot convention and /etc/default/grub option is changed to:
GRUB_TIMEOUT_STYLE=hidden

To solve, manually change this addition back to default GRUB2 setting of:
GRUB_TIMEOUT_STYLE=
which defaults to show, or set explicitly using
GRUB_TIMEOUT_STYLE=menu

then update-grub

This was mentioned in post #23. Adding this comment to show it's repeatable. If you re-install grub2, then a dual-boot is not recognised.

@Julian Please re-assess. Your comments match only a single boot install.