why am i not able to add any ppa repositories?

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http://askubuntu.com – karan@karan-HP-630-Notebook-PC:~$ sudo add-apt-repository ppa:danielrichter2007/grub-customizer You are about to add the following PPA to your system: This PPA contains the latest release of Grub Customizer. More info: https://launchpad.net/~danielrichter2007/+archive/grub-customizer Press [ENTER] to continue or ctrl-c to cancel adding it Traceback (most recent call last): File "/usr/bin/add-apt-repository", line 177, in <module> if not sp.add_source_from_line(line): File "/usr/lib/python2.7/dist-packages/softwareproperties/SoftwareProperties.py", line 718, in add_source_fro (HowTos)