I can't boot previous install of KDE (partition 9), which was working fine before crashed upgrade of Ubuntu.
So is that what you now want to do, to be able to boot Neon on partition 9? When you boot Neon, verify if you have not yet, that you are using Neon on partition 10. You can do that with the df -h command which should show output similar to the example below:
Code:
/dev/nvme0n1p10 47G 20G 25G 45% /
You should see the forward slash indicating the root system partition at the end of that line. If you are booted into Neon on partition 10, go to the /boot/grub/grub.cfg file and check it for any entries for Neon on partition 9. If there are any entries, check the UUID used in each entry with the UUID you get for partition 9 using sudo blkid.
I'm not sure what your problem is now. Do you want to be able to access Neon on partition 9 or do you want to install Ubuntu over that partition?
Oddly, mount points are changing between boots. (It literally just swapped /dev/dev/nvme1n and /dev/nvme0n after a few boots.)
Those are device names not mount points and should not change if you are booting from the USB shown as sda in boot repair or if you are booting from Neon on the /dev/nvme0n device, the one on partition 10. I noticed in your boot options from an earlier image that windows was shown as nvme1n1p1? Boot repair shows it on nvme0n1p3. This is not expected to change unless the drives are being attached to different ports between boots so I don't know why that happens.
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