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

Unexpected SPC Access Width error returning to default e

What’s happened: I have modified the fstab file. My aim was to mount an external hard disk permanently. I duly changed the username, but forgot to change the “sdb4″ to sdb1” in the command line and pasted it to a terminal window. Now Ubuntu does not boot, I am on a choo-choo train or loop, and I have forgotten the root password. This afternoon I created a boot repair usb stick, but this does not work either. F6 key does not work and I cannot choose the “no mode set”. I fear I might well have to delete the Ubuntu partition (I am on dual boot: windows 7 /Ubuntu 18.4) and try a fresh install, thus losing some data….

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Author: Christophe Naud