Are you using Ubuntu 19.04? I had that same error.. Right click on the console tab, and see "editor log". In the editor log do you see a "no usable libssl found"? If that's the case, it's still looking for libssl.1.0.0 .. Which you can just add to your system: http://security.debian.org/debian-s...penssl/libssl1.0.0_1.0.1t-1+deb8u11_amd64.deb (Ubuntu 19.04 no longer ships with libssl.so.1.0.0) dotnet acknowledges this and has a patch but I suppose we don't have it yet. But it's a workaround for now for those who need it.
The issue seems to be solved in 2019.3 : https://issuetracker.unity3d.com/issues/linux-roslyn-fails-if-there-is-a-newer-libssl-than-1-dot-0. (i did not test it yet) You can also see this thread : https://forum.unity.com/threads/empty-log-errors-in-2019-1-0f2.669961/#post-481712