Re-Install Ubuntu after it was down

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My Ubuntu 18.04 LTS ran for a long time, and I did many things what maybe slow down the computer, what was worse, it could NOT boot normally as usual. When I checked the log file, found that it due to some error of the Elan touchscreen. May be some error of the EFI file, too.

So, I decided to re-install a new one.

As you know, I had Ubuntu and Windows 10 dual boot systems.

REMEMBER to choose Install alongside the Windows boot manager

It is better for beginners, in my opinion.