Boot menu not displayed for multi boot with ZFS

[BertN45]

I have 2 systems installed on ZFS
- Ubuntu Mate 18.04.3
- Xubuntu 19.10

For the coming period I like to keep one ext4 installation, so I did do a fresh install of Ubuntu 19.10 on the ext4 sda1 partition. I installed zfsutils-linux and rebooted. Afterwards I did run "update-grub" and "grub-install" and both Ubuntu systems on ZFS were detected looking at the output. In /boot/grub/grub.cfg all 3 systems were present. After reboot the menu still did not show, grub did not detect the multi-boot. Only after changing /etc/default/grub the boot menu appeared on the next boot.

As far as I understand the menu should appear by default in a multi-boot situation.

[Andrea Righi (arighi)]

Isn't this the expected behavior? In order to show the boot menu in grub we need to set GRUB_TIMEOUT_STYLE / GRUB_TIMEOUT in /etc/default/grub and run update-grub. Am I missing something?

[Julian Andres Klode (juliank)]

That's correct, the menu should not show automatically, you either configure it to do so or you press Esc during boot. Marking as invalid.

[BertN45 (lammert-nijhof)]

That report is so long ago. I don't know, what happened anymore.