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AinulBedjo avatar Ubuntu

can not open grub menu

us flag
AinulBedjo

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> /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"
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Someone avatar
my flag
Someone
Try changing grub timeout line to `GRUB_TIMEOUT=5`
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vanadium avatar
cn flag
vanadium
It is sometimes hard, but try hitting and releasing escape every half second while booting.
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AinulBedjo avatar
us flag
AinulBedjo
will do, alright
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AinulBedjo avatar
us flag
AinulBedjo
@vanadium hey, it's working
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vanadium avatar
cn flag
vanadium
I will post this then as an answer - I also learned this the hard way ;)
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vanadium avatar Ubuntu
cn flag
vanadium

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.

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