I am facing a problem with /etc/apt/sources.list
The 52nd line appears to be malformed
Line 52: deb http://archive.canonical.com/ precisepartner
Line 53: deb-src http://archive.canonical.com/ precisepartner
This problem has caused Synaptic Package Manager and Ubuntu Software Center to not function properly and close abruptly.
/etc/apt/sources.list.d/
directory by adding a new file.