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avatar Ubuntu

Grub can't find kernel when booting Lubuntu

in flag
PLui

I have an old PC I haven't used for about 10 years. It has Ubuntu 11.04 and Windows installed. I wanted to install Lubuntu on it and be able to use grub to choose what to boot into.

I installed Lubuntu 20.04 LTS and installation was fine. I have 3 disks on the PC and Ubuntu and Lubuntu are on /dev/sdc. When I first installed Lubuntu, there was no entry in grub for it. I then ran boot-repair and it added some entries. For example:

Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os 'gnulinux-simple-xxxxxxxxxsome-guidxxxxxx (on dev/sda8)

When I tried to select the above, I get this:

error: file not found. error: you need to load the kernel first

I'm not sure what kind of diagnostic info would be helpful.

Edit: Ran sudo grub-mkconfig -o /boot/grub/grub.cfg.new and got the following output. Notice there is no new Linux kernel listed:

Generating grub.cfg ...
Found linux image: /boot/vmlinuz-2.6.38-10-generic
Found initrd image: /boot/initrd.img-2.6.38-10-generic
Found linux image: /boot/vmlinuz-2.6.35-22-generic
Found initrd image: /boot/initrd.img-2.6.35-22-generic
Found linux image: /boot/vmlinuz-2.6.32-24-generic
Found initrd image: /boot/initrd.img-2.6.32-24-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Microsoft Windows XP Professional on /dev/sdc1
done
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avatar Ubuntu
de flag
limanux 
grub-mkconfig -o /boot/grub/grub.cfg

Update your grub file it should solve that issue.

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in flag
PLui
boot ubuntu and run that command? I ran that command without update to see the output before but I didn't see it point to the Lubuntu partition. There might be some weird setup with my MBR that's causing this.
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de flag
limanux
You need to use sudo first if you think it still not detected you can cat out to see the file try reinstalling grub or grub2.
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in flag
PLui
I ran with sudo and here is the output. Notice the linux kernels are all really old: ```Generating grub.cfg ... Found linux image: /boot/vmlinuz-2.6.38-10-generic Found initrd image: /boot/initrd.img-2.6.38-10-generic Found linux image: /boot/vmlinuz-2.6.35-22-generic Found initrd image: /boot/initrd.img-2.6.35-22-generic Found linux image: /boot/vmlinuz-2.6.32-24-generic Found initrd image: /boot/initrd.img-2.6.32-24-generic Found memtest86+ image: /boot/memtest86+.bin Found Microsoft Windows XP Professional on /dev/sdc1 done ```
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my flag
Someone
If you're wondering what's happening with the votes: **Manually updating the GRUB files using `grub-mkconfig` are highly discouraged**, one should use the `sudo update-grub` command instead. Moreover, updating the GRUB files won't help in this case, so, your answer is incorrect and is downvoted as such.
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in flag
PLui
Any suggestion as to how to fix it?
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