Can't boot into kubuntu because partitions show mmc instead of sda

bsth123 · 05-04-2017, 08:47 AM

It didn't work. I did update-grub /dev/sda and it seemed to work but I still get the boot options that don't work. What if I copied the grub.cfg file to /dev/sda after editing the boot options? I know there has to be a way to do this.

Shadow_7 · 05-04-2017, 09:15 PM

If you put custom grub menu items into /etc/grub.d/40_custom it will get included when you run update-grub. Depending on your grub version or distro grub.cfg might default to /dev/ names that are not always reliable. Using LABELS or UUIDs tends to be more reliable IMO, since /dev/ names shift when you start adding more devices on more types of buses.

$ sudo blkid

file: /etc/fstab

Code:

/dev/sda1                                 / ext4 defaults,noatime 0 1

Code:

LABEL=11111111                            / ext4 defaults,noatime 0 1

Code:

UUID=11111111-1111-1111-1111-111111111111 / ext4 defaults,noatime 0 1

Just different ways to say the same thing.

file: /etc/grub.d/40_custom

Code:

#!/bin/sh
exec tail -n +3 $0
# previous two lines from debian's default / original version of the file.
        menuentry '40_custom, Linux 3.16.0-4-amd64' {
                insmod part_msdos
                insmod ext2
                linux /boot/vmlinuz-3.16.0-4-amd64 root=UUID=11111111-1111-1111-1111-111111111111
                initrd /boot/initrd.img-3.16.0-4-amd64
        }

Although I haven't tested that entry. It's basically cut and past and simplified from what update-grub creates. All the things you would enter from grubs command line mode to boot the kernel.