How do I install applications on Linux?

For example, you’d double-click a downloaded . deb file, click Install, and enter your password to install a downloaded package on Ubuntu. Downloaded packages can also be installed in other ways. For example, you could use the dpkg -I command to install packages from the terminal in Ubuntu.

Where should I install applications in Linux?

For all path-related questions, the Linux Filesystem Hierarchy Standard is the definitive reference. If the program needs to create a folder, then /usr/local is the directory of choice; according to the FHS: The /usr/local hierarchy is for use by the system administrator when installing software locally.