I'm not sure where to ask this question. My questions have been removed from Stack Overflow (which would be my first assumption as to where this question should go) before because they are not strictly about programming.
I am trying to download the text-based browser elinks by following the video Elinks installation tutorial (Ubuntu/Mint) , but I could not because the terminal gave me the error "sudo: apt-get: command not found". What should I do to fix this so that I can download elinks.
Here is a picture of my terminal in case it is helpful: