Well, I had some trouble the last days with my pc, after trying to fresh install Windows 10 for some university projects. I don't know exactly what happened (maybe was my mistake 😋) but the results were my Ubuntu partition to be completely erased.
At least I had a backup of my projects on another partition that saved my life... The only problem now is to setup again my Desktop environment. In conclusion, always keep a second backup of your "important stuff".