Possible Duplicate:
How do I remove a malformed line from my sources.list?
“Malformed line 6” error in my /etc/apt/sources.list
My Software Center is not opening or closing by itself:
E:Malformed line 57 in source list /etc/apt/sources.list (dist parse)
E:The list of sources could not be read
E:The package lists or status file could not be parsed or opened.