Wine-staging fails to install on 18.04

I followed the instructions found here to download the missing libfaudio:i386.

Ubuntu 18.04:

wget https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/xUbuntu_18.04/Release.key

sudo apt-key add Release.key

Add the repository:

sudo apt-add-repository 'deb https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/xUbuntu_18.04/ ./'

Then update:

sudo apt update

I had similar problem, I went down a few different rabbit-holes so thought it might help others if I detail my solution. I am not particularly au fait with the apt packaging process or wine so I will list out everything that I went through from upgrading from wine3.0 to wine5.0 on ubuntu 18.04.4 LTS.

1. Purge all from APT!

sudo apt-get purge *wine*

2. Check that there's no snaps installed too (for some reason i had this - not sure if it would impact so i assumed best to remove)

sudo snap remove wine
sudo snap update wine-platform-*

3. Remove the PPA official repos (they changed how they packaged this). We need to dig inside /etc/apt

grep -Ril "wine" /etc/apt

If you get any matches comment them out or delete the keys, we will fully re-add later.

4. Enable 32-bit & add new repo (check here for other ubuntu versions)

sudo dpkg --add-architecture i386
wget -nc https://dl.winehq.org/wine-builds/winehq.key
sudo apt-key add winehq.key
sudo apt-add-repository 'deb https://dl.winehq.org/wine-builds/ubuntu/ bionic main'
sudo apt update
sudo apt upgrade
sudo apt --fix-broken install
sudo apt autoremove --purge
sudo apt upgrade

5. Let's get the libfaudio & libasound2 which are the broken repos:

wget https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/xUbuntu_18.04/Release.key
sudo apt-key add Release.key
sudo apt-add-repository 'deb https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/xUbuntu_18.04/ ./'
sudo apt update
sudo apt install libfaudio0 libasound2-plugins:i386 -y

6. Now we can install wine 5.0 as normal!

sudo apt install --install-recommends winehq-stable -y

As pointed out by @chilly-chease, libfaudio0:i386 package is missing in ubuntu 18.04 repositories.

The most simple way to fix it would be:

1. sudo add-apt-repository ppa:cybermax-dexter/sdl2-backport
2. sudo apt install --install-recommends winehq-staging