VRCX provides the [install-vrcx.sh](https://github.com/vrcx-team/VRCX/blob/master/Linux/install-vrcx.sh) script upstream, which does the steps of the manual installation for you.
You can run it per `curl -sSf https://raw.githubusercontent.com/vrcx-team/VRCX/master/Linux/install-vrcx.sh | bash`.