Project created with Unity-2018.2.7f1 doesn't compile with Unity-2019.1.0f2

Hi,

I have about 72 similar compile errors:

/home/ebak/Stuff/Unity/Stick/Library/PackageCache/com.unity.textmeshpro@2.0.0/Scripts/Runtime/TMP_FontAsset.cs(1222,238): error CS1644: Feature `out variable declaration' cannot be used because it is not part of the C# 4.0 language specification

Any idea how to resolve them?

Thanks!

 

Solved: https://stackoverflow.com/a/56068952/1123867

 

I ran into other issues too. The most annoying is: "Couldn't extract exception string from exception of type StackOverflowException (another exception of class 'NullReferenceException' was thrown while processing the stack trace)".
Here: http://www.berserk-games.com/forums/showthread.php?7653-Freezes-on-Linux people saying it is a Unity engine bug.
Is there newer version than Unity-2019.1.0f2 available for Linux which fixes this and other bugs?

Is the Linux editor developed with the "It is OK if sometimes something is working" approach in mind?