I'm trying to install this according to this guide, but when I go to install libqt5gamepad5-dev, I get "Package not found". I've
sudo apt update'd multiple times to no avail. How do I fix this problem?
That's right, the package
libsq5gamepad5 and it's associated
-dev are not in the 18.04 repositories. They were added to Ubuntu during the later 18.10 cycle, and are in releases of Ubuntu 18.10 and newer.
Deb packages in the repositories are re-built for each new release of Ubuntu. The easiest way to use the package is to migrate to a newer release of Ubuntu that has the package.
We generally recommend against trying to use a wrong-release package on your Ubuntu system. While an expert may (or may not) be able to make it work using a bit of
dpkg magic, a new user is much more likely to merely break their system.