The default-java folder is a symbolic link to the actual location of the JDK install on Ubuntu. When you reference the JDK install location in applications or in environment variables such as ...

Linux has many ways to install applications, including Personal Package Archives in Debian and Ubuntu-based distributions. Here's how they work.

If you're using Linux, installing apps works a bit differently: Here's how to get software packages installed on Linux, and the key terms you need to know.