Crash on Ubuntu 20.04

[Varollo]

When trying to run a dedicated server on Ubuntu 20.04 I keep getting this error:

NullReferenceException: Object reference not set to an instance of an object
  at kcp2k.KcpTransport.ServerStart () [0x00000] in <3f58c2d5ab6045e99072d494f8577adc>:0
  at Mirror.NetworkServer.Listen (System.Int32 maxConns) [0x00012] in <3f58c2d5ab6045e99072d494f8577adc>:0
  at Mirror.NetworkManager.SetupServer () [0x00066] in <3f58c2d5ab6045e99072d494f8577adc>:0
  at Mirror.NetworkManager.StartServer () [0x00019] in <3f58c2d5ab6045e99072d494f8577adc>:0
  at Mirror.NetworkManager.Start () [0x00008] in <3f58c2d5ab6045e99072d494f8577adc>:0

Steps to reproduce:

• Create a mirror project using Kcp Transport or clone this test repository
• Build it with IL2CPP
• Run on Ubuntu version 20.04

What fixed for me

To not get the error I had to run it on an older version of ubuntu (18.04).

[miwarnec]

@Varollo please debug to see which line this exception happens on.
please try without IL2CPP.
please try with IL2CPP but without 'nonalloc' option.
and report back