Before 2 weeks ago I can develop games on Ubuntu with Unity3D but after some updates or somethings I give "all compiler errors have to be fixed before you can enter play mode" messages. If I compile code on Intellij Rider it's ok, no problem. There is nothing on Unity console and I am researching about it since 2 weeks but I can not find any solution. I tried to install mono and .net core, yesterday find line ending problem an try to different editor but they don't work.
Create new 2D project
Add empty object to scene
Add script to empty object
unity3d: 2017.4.26f1 and 2019.1