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after upgrading to 19.04 the Grub menu have become hidden. It still works and I can boot to both Windows 10 and Ubuntu by blindly finding the entry and pressing enter. I have tried to edit the /etc/default/grub and running sudo update-grub afterward but no change. Here is how it looks now:

# 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=0
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
GRUB_TIMEOUT_STYLE=menu
GRUB_HIDDEN_TIMEOUT_QUIET=false

# 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"

I can't use either Shift or Esc to make it visible too. After pressing either of these, Grub doesn't work anymore and I need to turn my laptop off and on in order to boot.

Edit: Not sure if it helps or not, but I just realized that if I go to the BIOS when I exit BIOS the grub menu shows up with no problem. The next time I boot, the grub menu is invisible again.

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    You should remove or comment out the line GRUB_HIDDEN_TIMEOUT_QUIET=false, it's deprecated. Then run sudo update -grub. I'm not sure if this solves your problem, but you should definitely try it. – mook765 May 10 '19 at 16:49
  • Thanks for your response. I did it, but as you imagined yourself, it didn't solve the problem. This was actually one of the lines that I added by reading other posts here trying to solve the problem. – rezafa May 10 '19 at 20:50
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I had exactly the same problem.

After trying several solutions, one did the trick (explaining with details in case someone else needs it):

  1. Edit /etc/default/grub by running in terminal while in the correct folder:

    sudo gedit grub
    
  2. Uncomment the line #GRUB_TERMINAL=console. The correct version shall be:

    GRUB_TERMINAL=console
    
  3. Save the file.

  4. Run in terminal:

    sudo update-grub
    
  5. Restart. GRUB menu shall appear now.

Note: I don't know why but graphical terminal wouldn't work. The console is a bit uglier but I don't care.

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    Thanks! It solved the problem. I wonder what could be the problem, maybe the graphic card driver? Anyway, thanks! – rezafa Jun 27 '19 at 15:25
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I also had this problem. Your description lead me to the final solution: GRUB-GFXMODE=auto was the problem.

I entered the GRUB console by pressing C (after I had uncommented the GRUB console output in /etc/default/grub so that the GRUB menu was visible again) and ran the command videoinfo which returned nothing.

Ok, with an automode that doesn't work, any output is difficult ;-) That´s the cause of the problem. The system doesn´t automatically detect the screen resolution. It´s necessary to manually enter a proper value.

I changed to GRUB-GFXMODE=1280x800, which is the known resolution of my laptop, your values may of course differ. Editing the grub file was possible in graphic mode with file manager opened in root-mode (you need root privileges to alter a system file), for the grub-update command I used of course a terminal, as described in Felipe's post.

And finally, I had my beautiful GRUB screen back :-)

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