Ubuntu 20.10 + WSL 2 + XRDP PulseAudio

readme.txt

# Credits
# https://c-nergy.be/blog/?p=13655
# https://askubuntu.com/questions/844245/how-to-compile-latest-pulseaudio-with-webrtc-in-ubuntu-16-04
# https://askubuntu.com/questions/496549/error-you-must-put-some-source-uris-in-your-sources-list
# https://unix.stackexchange.com/questions/65167/enable-udev-and-speex-support-for-pulseaudio
# https://rudd-o.com/linux-and-free-software/how-to-make-pulseaudio-run-once-at-boot-for-all-your-users
# https://gist.github.com/rkttu/35ecab5604c9ddc356b0af4644d5a226

# First, you should install XRDP and X11 Desktop Environment first.

# Step 1 - Install Some PreReqs
sudo apt-get install git libpulse-dev autoconf m4 intltool build-essential dpkg-dev libtool libsndfile1-dev libspeexdsp-dev libudev-dev -y

# Enable source repo
sudo cp /etc/apt/sources.list /etc/apt/sources.list~
sudo sed -Ei 's/^# deb-src /deb-src /' /etc/apt/sources.list
sudo apt-get update

sudo apt build-dep pulseaudio -y

#  Download pulseaudio source in /tmp directory - Do not forget to enable source repositories
cd /tmp
apt source pulseaudio

# Compile
pulsever=$(pulseaudio --version | awk '{print $2}')
cd /tmp/pulseaudio-$pulsever
./configure --without-caps

# Create xrdp sound modules
git clone https://github.com/neutrinolabs/pulseaudio-module-xrdp.git
cd pulseaudio-module-xrdp
./bootstrap 
./configure PULSE_DIR="/tmp/pulseaudio-$pulsever"
make

#copy files to correct location (as defined in /etc/xrdp/pulse/default.pa)
cd /tmp/pulseaudio-$pulsever/pulseaudio-module-xrdp/src/.libs
sudo install -t "/var/lib/xrdp-pulseaudio-installer" -D -m 644 *.so

# TODO: Register pulseaudio as a service

# Restart xrdp
## not allowed: "may be requested by dependency only (it is configured to refuse manual start/stop)."
# sudo service dbus restart

## only once pulseaudio has been registered as a service
sudo service pulseaudio restart

sudo service xrdp restart

The first error says that you don't have write permission in the directory where you're running configure. I don't know if that's normal for whatever operating system you're running, and determining that and fixing it is out of scope for this gist.

The cleanest and safest way I can think of to make these instructions work for you is to

1. create a directory in your home directory like mkdir -p ~/pulseaudio, then
2. start following the instructions above from line 22, replacing /tmp with ~/pulseaudio everywhere.