A message is coming on screen when I'm trying to download updates. It says:
Report this bug against update manager package.
and then:
E: Malformed line 54 in source list/etc/apt/sources.list(dist parse)
You have an error in line 54 of your /etc/apt/sources.list I can't really explain that too much more clearly. It's just saying that that line is not in the correct format, or perhaps that you deleted one of the pounds, so something that should have been a comment is now getting read.
sources.list
file? Can you post the contents of the file here, please?