Unable to Access Github.com



I started the Web Dev course and during the set up for my Ubuntu OS on my VM I discovered that my web browser will not connect to Github. I have tried updating everything, and I can still install Ruby and what not using the git function, but every time I try to access github.com it says that the owner has an invalid security certificate. I have checked the time and date on my VM.


what browser do you use?
and what os you use?
also, can you give me a screenshot or video about this proplem