Hi, people!
I was trying to install Skype today and searching for a tutorial I founded one. There was three command lines to execute on terminal.
First: sudo add-apt-repository "deb http://archive.canonical.com/$(lsb_release -sc) partner";
Second: sudo apt-get update;
Third: sudo apt-get install Skype;

Typing this that's what happened.
"edgar@edgar-RV411-RV511-E3511-S3511-RV711-E3411:~$ sudo add-apt-repository "deb http://archive.canonical.com/$(lsb_release -sc) partner"
[sudo] password for edgar:
edgar@edgar-RV411-RV511-E3511-S3511-RV711-E3411:~$ sudo apt-get updateE: Malformed line 60 in source list /etc/apt/sources.list (dist parse)
E: The list of sources could not be read.
edgar@edgar-RV411-RV511-E3511-S3511-RV711-E3411:~$ sudo apt-get install skype
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Malformed line 60 in source list /etc/apt/sources.list (dist parse)
E: The list of sources could not be read.
E: Unable to locate package skype
edgar@edgar-RV411-RV511-E3511-S3511-RV711-E3411:~$ "


Now, neither Ubuntu Software Center nor Ubuntu Tweak works anymore. The former just doesn't open and the latter the function of apps doesn't work also.
Hope somebody help me.