There are many questions about this topic. Here I provide a basic/general answer. When apt-get install is unable to locate a package, the package you want to install couldn’t be found within repositories that you have added (those in in /etc/apt/sources.list and under /etc/apt/sources.list.d/). The following (general) procedure helps to solve this: Make sure you have enabled Ubuntu repositories: To enable all repositories (main, universe, restricted, multiverse), use the following commands: sudo add-apt-repository main sudo add-apt-repository universe sudo add-apt-repository restricted sudo add-apt-repository multiverse Visit Help for more information. For finding PPA for more packages: Go to Ubuntu Package Search. (Already explained in this answer) For External Repositories, Visit Ubuntu Updates…