.NET Core 3 RTM, issue resolving SDK

[vcsjones]

I'm facing an issue very similar to #1541 however on Linux and am not sure how to troubleshoot or proceed.

In short, it looks like Omnisharp is not able to resolve the SDK and I get the errors:

The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) (CS0246)

Which I can reproduce with a simple dotnet new console and opening it with VS Code.

Some logs:

Registered MSBuild instance: StandAlone 16.0 - "/home/kjones/.vscode/extensions/ms-vscode.csharp-1.21.3/.omnisharp/1.34.4-beta.7/omnisharp/.msbuild/Current/Bin"
MSBuildExtensionsPath = /home/kjones/.vscode/extensions/ms-vscode.csharp-1.21.3/.omnisharp/1.34.4-beta.7/omnisharp/.msbuild
BypassFrameworkInstallChecks = true
CscToolPath = /home/kjones/.vscode/extensions/ms-vscode.csharp-1.21.3/.omnisharp/1.34.4-beta.7/omnisharp/.msbuild/Current/Bin/Roslyn
CscToolExe = csc.exe
MSBuildToolsPath = /home/kjones/.vscode/extensions/ms-vscode.csharp-1.21.3/.omnisharp/1.34.4-beta.7/omnisharp/.msbuild/Current/Bin

This is on Ubuntu 19.04, so there is no Visual Studio installation that has a conflicting msbuild installation.

The only warning I saw in the logs was:

warn: OmniSharp.MSBuild.PackageDependencyChecker
scratch: Did not find 'Microsoft.NETCore.App' in lock file.

Any advice to troubleshoot would be greatly appreciated.

[vcsjones]

Okay, it looks like this might actually be resolved with #1606. Double checking.

[vcsjones]

I see this has been discussed extensively at dotnet/vscode-csharp/issues/3289 and dotnet/vscode-csharp/issues/3290. I will close this to reduce noise. Thanks!