package "xorg, gnome3,..." (everything for desktop) not found

I want to install desktop for freebsd but that is difficult. I can't find packages for the desktop. And I'm a newbie.

Here are a few results of my command lines
P/S: I using freeBSD 11.3-STABLE, And i use pfsense image. And pfsense is based on freeBSD. Then pffsense auto install freeBSD for me

Bash:
pkg update
=> pkg: No packages available to install matching 'update' have been found in the repositories
Bash:
pkg upgrade
=> pkg: No packages available to install matching 'upgrade' have been found in the repositories
Bash:
pkg install xorg
=> pkg: No packages available to install matching 'xorg' have been found in the repositories
Bash:
pkg search xorg
=> xorg-macros-1.19.2
Bash:
pkg install gnome3
=> pkg: No packages available to install matching 'gnome3' have been found in theepositories
Bash:
pkg search gnome3
=> nothing
Bash:
pkg search -g \* | wc -l
=> 526

Help me, bro
 
How about you start with something downloaded from www.freebsd.org (say, an actually FreeBSD install image) and skip that pfsense image, because we don't make them, don't know what they changed and that we surely don't support here.
 
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