Make sure there's avahi daemon running.
ps aux | grep avahi-daemon | grep -v grep || sudo apt-get install avahi-daemon
Snapclient should work out of the box once you've installed the right package from https://github.com/badaix/snapcast/releases/tag/v0.10.0 (or a newer release). Pick the one with the right type (ie. a client as opposed to a server) with the right architecture (amd64 for a standard laptop or PC) and the right extension (.deb).
In GUI, download it and then double click it.
From command line something similar to this:
cd && wget https://github.com/badaix/snapcast/releases/download/v0.10.0 /snapclient_0.10.0_amd64.deb &&
sudo dpkg -i snapclient_0.10.0_amd64.deb
If you are at the point of installing the Raspbian, there are two main ways to go. You can put on the SD card:
The former is much easier, as the audio will be installed and configured. With the latter no audio will be installed by default.
You can get one at https://www.raspberrypi.org/downloads/noobs/.
Once the Pi is up and running, follow the instructions for Ubuntu above, but pick a package for armhf architecture.
That's the one:
There are similar ones elsewhere, but they may differ.
The following instructions may be incomplete or not exactly right. There may be quite a bit of troubleshooting involved.
1. Make sure the soundcard kernel module is loaded
sudo modprobe snd-bcm2835
2. Install Alsa mixer and base
sudo apt-get install alsa-utils alsa-base
The aim now is to have Alsa detect the soundcard. It is ok if there is a soundcard description produced by this command:
sudo amixer
If there's no, it's a time for more advanced troubleshooting. Check if Linux can see any cards at /proc/asound and good luck with the rest. As a tip, good or bad, you can try to install Alsa player and its daemon with
sudo apt-get install alsaplayer-common alsaplayer-daemon
3. Configure the mixer to use the 3.5 jack (as opposed to HDMI)
amixer cset numid=3 1
4. Follow the instructions for RPi Manual installer above.