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I have two hard disks, one which contains Windows 10 and the other one contains Ubuntu (20.04). The ubuntu hard disk has full disk encryption using LVM.

The problem I'm seeing is that every time I try to boot into my Ubuntu disk I get thrown at the grub command line. I know how to make it boot but it's very annoying having to do that every single time I want to switch operating systems. I've already tried to sudo update-grub2 or try to remove and reinstall grub. I still get the same exact error.

After browsing online I came across the boot-repair tool which should hopefully solve my problems but it ends up that it still won't work correctly as I expect it to. This is the output from boot-repair https://paste.ubuntu.com/p/wthpKpVRyV/

These are the contents of my /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=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=lsb_release -i -s 2> /dev/null || echo Debian
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="rhgb quiet splash acpi_enforce_resources=lax pcie_ports=compat"
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"
Guido Dobboletta
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  • Don't use boot-repair. Can you edit your question and add the contents of your grub file please? Open a terminal and trype sudo gedit /etc/default/grub and copy & paste the text (don't change anything yet). – darth_epoxy Aug 18 '21 at 06:43
  • I have now edited my question @darth_epoxy with the contents of it – Guido Dobboletta Aug 19 '21 at 15:36

1 Answers1

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I recommend that you add these lines;
Open a terminal and type sudo nano /etc/default/grub or use gedit.
GRUB_DEFAULT=0
#GRUB_DEFAULT=saved
#GRUB_SAVEDEFAULT=true
#GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=10
Add this for the CMDLINE but this is speculative and after a few sucessful boots you can change it back. So just comment out with # rather than delete any lines. Also you can tweak this grub file if you find out more information down the line.
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="rhgb quiet splash acpi_enforce_resources=lax pcie_ports=compat"
GRUB_CMDLINE_LINUX=""
And uncomment this line;
GRUB_TERMINAL=console
Save using the same filename (in nano use Ctrl+O)
After you save make sure to update grub or nothing happens!
Type sudo update-grub and this will generate a new cfg file.
Type sudo shutdown -r now and report back the result.
Note: This will make you boot to the grub menu which will help diagnose problems if this Answer is incomplete. You can change that back at any time afterwards.

darth_epoxy
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  • Unfortunately this did not work for me. I have updated my original answer to show my current /etc/default/grub. When I run sudo update-grub it also says it sees my windows hard drive but when I get to the grub menu running the manual commands I don't see the entry either. – Guido Dobboletta Aug 21 '21 at 19:46
  • Bugger. If you are getting the grub console instead of the grub menu, what were you typing to make it boot? There is a long form answer here for grub console problems and it might be wortha read https://askubuntu.com/questions/1280087/grub-failed-to-install-cant-boot-neither-windows-nor-ubuntu/1280155#1280155 – darth_epoxy Aug 21 '21 at 23:29
  • This is what I type to make it boot

    set root=(hd1,2) set prefix=(hd1,2)/grub insmod normal normal

     – Guido Dobboletta Aug 22 '21 at 00:04