F8 and Esc should work. The change page [1] mentions also holding shift.
It also mentions "sudo grub2-editenv - unset menu_auto_hide".
But it is interesting that:
1. it does not work
2. it does not unhide itself after failed boot.
Both sounds as a bugs to me.
V.
[1]
https://fedoraproject.org/wiki/Changes/HiddenGrubMenu
Dne 18.9.2018 v 01:12 Chris Murphy napsal(a):
I've got a Fedora 29 Silverblue installation in a VM. First boot
I see
the GRUB menu, and after that it's hidden. And I can't figure out how
to unhide it. Boot is failing before I get multiuser login or ssh, so
extracting information to troubleshoot/bug report isn't possible.
Repeatedly pressing or holding Esc doesn't work.
Spacebar doesn't work.
F8 doesn't work.
So now I'm stuck. Yeah, I can reinstall, and before rebooting make
sure whatever is hiding the GRUB menu is disabled, every time I do
installations. But the very reason why people were so vocal about this
feature not happening is exactly this use case.
This is a Fedora 29 host. Fedora 29 (silverblue, maybe it happens with
Workstation as well) as guest. Virt-manager is what I'm using for
interacting with the VM.