What does "install" mean?

[Daniel Bo]

Installing a package means ... installing a package (i.e. a DEB
package on Ubuntu). The package name is explained in each section. You
can use any supported method to do that (i.e. Synaptic, apt-get,
aptitude, or Ubuntu Software Center). Realistically, you just need to
upgrade after adding one of the PPAs.

Installing a .tar.gz or .tgz is not the same as installing a package
(unless you're a Slackware user) and that is explained in
"."Installing from the Mozilla website."

Dan