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I was very happy user in Ubuntu but when this problem came

This is my first big problem

I detected that VirtualBox was the problem, I tried so hard to fix it but I couldn't, So I formatted my system and installed Ubuntu once again.

But now my system is freezing and this is annoying as I don't know how to detect the problem.
I saw some Q&A here and I tried most of them but without any benefit.

So I need help!

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