Please supply me with some information on your system before asking questions. In your Terminal type inxi -S and copy and paste the results as the first line of Your Message. This will help me in answering questions.
Mine looks like this and you do not have to tell me the Host: as I am only interested in Kernel, Desktop and Distro:
System: Host: xxxx-xxxxxx Kernel: 3.13.0-27-generic x86_64 (64 bit) Desktop: Xfce 4.11.6 Distro: Linux Mint 17 Qiana