Missing packages after upgrade

[Dimitri Minaev]

Hello,

I have a virtual machine running FreeBSD. Last week the OS was upgraded
from 10.1 to 11.1-RELEASE. After the upgrade I tried to install Firefox,
but `pkg' cannot find the package in the repository:

$ sudo pkg install firefox
Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
pkg: No packages available to install matching 'firefox' have been found
in the repositories

$ sudo pkg search firefox
esteidfirefoxplugin-3.8.0.1115 Digital signing with Estonian ID card in
Firefox
linux-firefox-45.9.0,2         Web browser based on the browser portion
of Mozilla
xpi-firefox-showcase-0.9.5.6   Easily locate and select any open browser
window

Firefox is present in the ports directory, but not in the packages
database. I updated the database using -f option, but the result was the
same. I don't know if there are any other lost packages, but it seems
very probable. What's happened? How do I get the full database?