I'm truing to upgrade my packages because Ubuntu Software Center doesn't work. It just chashes when I'm trying to execute it. In terminal I wrote:
sudo apt-get update
And here is an answer:
E: Malformed line 57 in source list /etc/apt/sources.list(dist parse)
E: The list of sources could not be read.
So what should I do to solve this? And why this error occurred?