0

Here's my somewhat strange multi-boot config:

  • Windows 10 on a Surface Pro 4 (no secure boot)
  • Ubuntu 20.04 LTS on /dev/nvme0n1p5 partition
  • Lubuntu 21.10 on /dev/sda2 (SD card in built-in slot seen as /dev/sda)

For whatever reason, maybe because this is old tired hardware, I can't get into Lubuntu except by booting the Ubuntu partition from the UEFI firmware menu (hold down the Vol+ button when booting), then select the same (default) menuentry that fails when I bypass this mechanism and boot without mashing the Volume Up button.

The message when I select the Lubuntu or Advanced Lubuntu item is: "Can't find device: xxx(GUID)xxx; No such HD1; You need to load the kernel first".

Interestingly, Windows 10 boots OK either way? It's almost like I'm missing a modprobe to reveal /dev/sda. Also, USB mouse attached to Hub through the one USB 3.0 port sometimes won't work to scroll through the entries.

Maybe I should make the UEFI menuentry be the default? That way if the usb mouse/keyboard aren't functional, at least it will return to the menu where my (tri-) boot successfully launches.

Thanks for any advice or input!

AlMo320
  • 85

2 Answers2

0

Boot into the grub menu. Select Advanced options for Ubuntu → Recovery mode → grub.

This should find all 3 operating systems on the PC.

Error404
  • 8,278
  • 3
  • 35
  • 60
Aman9das
  • 21
0

Thanks @oldfred for pointing me at the solution. The following addition to 40_custom did the trick:

menuentry "Lubuntu 21.10 on sda" { 
   linux /boot/vmlinuz-5.15.14-surface root=/dev/sda1 ro quiet splash 
   initrd /boot/initrd.img-5.15.14-surface 
}
AlMo320
  • 85