system
4
I did finally notice that I had not downloaded a deb file. I followed your link and had no idea on how to run the terminal program… but figured that out:
click on dash home icon, top left.
type in terminal
run it = purple screen
at prompt: :~S
type avast
I was prompted for the code I was email and using the mouse to copy and paste worked.
— The avast program the scanned my machine in a couple of minutes and found nothing.