apt - Unable to find expected entry 'restricted/source/Sources' in Release file

I am unable to view any screen in my ubuntu, Also, when i do apt-get update.

I get below errors :-

1. Failed to download repository information.
   Check your internet connection

Details

W:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/Release Unable to find expected entry 'restricted/source/Sources' in Release file (Wrong sources.list entry or malformed file),

E:Some index files failed to download. They have been ignored , or old ones used instead.

How can i solve the issue.