Is it possible to install the application graphically without touching the command line? I said, “Yes, it’s possible to install applications graphically,” but you need to have an installer installed on your system. You can find a software installer inbuilt, but for some reason, you are not able to access it, or maybe the software installer is missing.If your problem is similar to my friend then this article will be very handy for fixing this problem

Source: LXer – How to install an application graphically in Ubuntu/Debian