First, completely uninstall Wine or get a fresh server to do this on. A fresh server is the best option here.
Next Install wine-stable with the following tutorial: https://tecadmin.net/install-wine-on-ubuntu/
Once you have that installed make sure wine --version
returns something like 5.0.1
or above.
Next, run:
apt-get install unrar-free unzip
cd ~
mkdir skaterxl-server
cd skaterxl-server
wget https://dl.winehq.org/wine/wine-mono/5.1.0/wine-mono-5.1.0-x86.msi
wine msiexec /i wine-mono-5.1.0-x86.msi
winetricks corefonts
wget https://github.com/silentbaws/XLMultiplayer/releases/download/v0.8.1/Server.rar
unrar e Server.rar && rm Server.rar
wineconsole XLMultiplayerServer.exe
This is should work to install Wine, Wine Mono and XLMultiplayer on linux.
cd ~/skaterxl-server
mkdir PSM
cd PSM
wget https://github.com/M4cs/XLMultiplayer/releases/download/v0.8.1-psm-0.1/XLMultiplayerServer.zip
unzip XLMultiplayerServer.zip
rm ServerConfig.json && mv * ..
Run the same command as normal and you will be running PSM 0.8.1!