So I tried to install "solaar" in the software center, and everything install without any problem; however, when I tried to open "solaar", it didn't work. The app just didn't open. So I tried to use the terminal, and it turned out that I need a specific dependency "psutil". So I went to the software center and downloaded it. However, same thing happened again and it still asked me for "psutil". I went back into the software center and downloaded "python-psutil". Finally it worked.
So I just wanted to let the developers know about this so maybe they could package "python-psutil" together with "solaar" so people don't have to go through this.