grub2 – World Of Nubcraft

ubuntu doesn’t work :UUID=xxxx does not exitst

My computer has two systems, Windows 10 and ubuntu18.04. Today, when I tried to get into Ubuntu(I already laid it aside for about one week ), the whole screen showed pure purple for at least 10 minutes, so I forced the computer to shut down.Then when I tried to get into Ubuntu again, it showed :
[enter image description here][1]
Then I tried to open ubuntu in recovery mode,but the outcome was same.And I also tried this solution:https://forums.linuxmint.com/viewtopic.php?t=47594,doesn’t work either.
At last I run fsck.ext4 -y /dev/sda1(where the root is),and showed:
[enter image description here][2]
Anyone know how to deal with is issue?Any help would be appreciated!
[1]: https://i.stack.imgur.com/n0nw2.png
[2]: https://i.stack.imgur.com/xEiga.png

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Author: OilLight

install grub on mounted filesystem

I have booted rescue linux (init ram fs), and mounted /dev/sda1 on /mnt/sda1

/dev/sda1 is a linux partition, but /dev/sda has no mbr.

Howe can I install grub on mounted filesystem /mnt/sda1 ?

I tried:

mount /dev/sda1 sda1/
mount -t proc /proc proc/
mount -t sysfs sysfs sys
chroot .

but then, when i do grub-install /dev/sda, I get this error:

Installing for i386-pc platform.
grub-install: error: failed to get canonical path of `/dev/sda1'.

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Author: 400 the Cat