I had the same problem - cant access to grub menu by esc or shift keys
during boot if I tried to hide it (I have windows and ubuntu on one
disk).
The reason is one strange condition in /etc/grub.d/30_os-prober script.
it bloks hidden menu part of grub.cfg if os-probber found any other os.
So for me works the following:
1. In the file /etc/grub.d/30_os-prober
- comment line 33: if [ "x${found_other_os}" = "x" ] ; then
- and comment closing it "fi" at line 67
2. Sudo updade-grub
After that if you have GRUB_HIDDEN_TIMEOUT >=1 then you can access to grub menu
by esc key during this timeout,
if you have GRUB_HIDDEN_TIMEOUT =0 then you can access to grub menu if you
press "shift" during grub startup,
and no hidden menu if GRUB_HIDDEN_TIMEOUT =-1.
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https://bugs.launchpad.net/bugs/425979
Title:
Holding shift fails to display grub2 menu
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