Lidarr - base url issue, port required - Resolved (Outdated Mono Version)

I would like to know the port used for lidarr on quickbox. I’ve have a few issues previously installing Ombi, and had to access the program locally to set the base url (not sure why it didn’t set on installation, I have letsencrypt installed and working and the quickbox link uses https://*****/Ombi) The same has happened to Lidarr and I can’t connect to it remotely and i’m unsure of the port it’s using

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It looks like it isn;t running. It is green on the dashboard.
b)~$ systemctl status lidarr
● lidarr.service - Lidarr Daemon
Loaded: loaded (/etc/systemd/system/lidarr.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2018-05-12 20:36:37 CEST; 1h 26min ago
Main PID: 189633 (mono)
CGroup: /system.slice/lidarr.service
└─189633 /usr/bin/mono /opt/Lidarr/Lidarr.exe -nobrowser

May 12 20:36:37 fi***** systemd[1]: Started Lidarr Daemon.
May 12 20:36:37 fi***** mono[189633]: [Info] Bootstrap: Starting Lidarr - /opt/Lidarr/Lidarr.exe - Version
May 12 20:36:37 fi***** mono[189633]: [Fatal] ConsoleApp: EPIC FAIL!
May 12 20:36:37 fi***** mono[189633]: [v0.2.0.371] System.MissingMethodException: Method ‘Array.Empty’ not found.
May 12 20:36:37 fi***** mono[189633]: at NzbDrone.Common.Disk.DiskProviderBase.EnsureFolder (System.String path) <0x405f14c0 + 0x00017> in :0
May 12 20:36:37 fi***** mono[189633]: at NzbDrone.Common.EnvironmentInfo.AppFolderFactory.Register () <0x405f12e0 + 0x00044> in :0
May 12 20:36:37 fi***** mono[189633]: at NzbDrone.Host.Bootstrap.Start (NzbDrone.Common.EnvironmentInfo.StartupContext startupContext, IUserAlert userAlert, System.
May 12 20:36:37 fi***** mono[189633]: at NzbDrone.Console.ConsoleApp.Main (System.String[] args) <0x40566ef0 + 0x000f7> in :0

Ok, I resolved this issue in case anyone has the same problem.
I didn’t realise Ubuntu 16.04 ships with an outdated version of mono. 4.2, Lidarr requires 4.6 or higher. To resolve I had to add as follows:-

sudo apt-key adv --keyserver hkp:// --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF

echo "deb xenial main" | sudo tee /etc/apt/sources.list.d/mono-official.list

sudo apt update

sudo apt install mono-devel

Installs 5.12 - Lidarr now working. 

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