Aptitude is preferred, but other approaches can be used if desired.

First, update the package index. The APT package index is essentially a database of available packages from the repositories defined in the /etc/apt/sources.list file and in the /etc/apt/sources.list.d directory.

sudo aptitude update

Now install the package.

sudo aptitude install package_name

First, update the package index. The APT package index is essentially a database of available packages from the repositories defined in the /etc/apt/sources.list file and in the /etc/apt/sources.list.d directory.

sudo apt update

Now install the package.

sudo apt install package_name