can not open grub menu

Question

I'm running ubuntu 20.04 on ryzen 5500U & integrated GPU.

I can't open grub menu even though I already pressed Shift / Esc button when boot up. I want to downgrade My kernel version since I can't login after suspend, it shows unresponsive black screen.

Kernel version : 5.14.10-051410-generic

/etc/default/grub file :

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'
GRUB_DEFAULT=-1
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=lsb_release -i -s 2&gt; /dev/null || echo Debian
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
Uncomment to enable BadRAM filtering, modify to suit your needs
This works with Linux (no patch required) and with any kernel that obtains
the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
Uncomment to disable graphical terminal (grub-pc only)
GRUB_TERMINAL=console
The resolution used on graphical terminal
note that you can use only modes which your graphic card supports via VBE
you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

It is sometimes hard, but try hitting and releasing escape every half second while booting. — vanadium, Nov 04 '21 at 09:49
I will post this then as an answer - I also learned this the hard way ;) — vanadium, Nov 04 '21 at 11:55

score 1 · Accepted Answer · answered Nov 04 '21 at 12:02

It can be hard to display the grub menu, but try hitting and releasing escape every half second while booting.

At the expense of a longer boot time, you edit the GRUB_TIMEOUT value in /etc/default/grub to add some seconds of waiting time. Then, Grub will wait some time before booting the default entry. During that time, you can press Esc or F4, or hold Shift to display the menu.

Here is how you can edit the grub configuration.

can not open grub menu

Uncomment to enable BadRAM filtering, modify to suit your needs

This works with Linux (no patch required) and with any kernel that obtains

the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

Uncomment to disable graphical terminal (grub-pc only)

The resolution used on graphical terminal

note that you can use only modes which your graphic card supports via VBE

you can see them in real GRUB with the command `vbeinfo'

Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

Uncomment to disable generation of recovery mode menu entries

Uncomment to get a beep at grub start

1 Answers1