please give me some advice on how to handle the illegal invasion into my pc (UBuntu20.04) ? I went back home and saw someone remotely accessing my pc browsing my documents, closing my browsers and viewing my conversation with other people in an app. I can't believe that this could happen so easily. But it did happen. I did not stop the hacker immediately when I saw that, instead I used my cellphone record that.
I don't know how the hacker got access to my pc remotely, could someone explain the typical way and talk about anti-hacking methods that I could use as an ordinary Ubuntu user.
Thank you very much.