System.IO.FileNotFoundException: Could not find 'mono' host. Make sure that 'mono' is installed on the machine and is available in PATH environment variable.

at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Helpers.DotnetHostHelper.GetMonoPath() in /_/src/Microsoft.TestPlatform.CoreUtilities/Helpers/DotnetHostHelper.cs:line 93

at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Hosting.DefaultTestHostManager.GetTestHostProcessStartInfo(IEnumerable`1 sources, IDictionary`2 environmentVariables, TestRunnerConnectionInfo connectionInfo) in /_/src/Microsoft.TestPlatform.TestHostProvider/Hosting/DefaultTestHostManager.cs:line 219

at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Client.ProxyOperationManager.SetupChannel(IEnumerable`1 sources, String runSettings) in /_/src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyOperationManager.cs:line 229

at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Client.ProxyExecutionManager.InitializeTestRun(TestRunCriteria testRunCriteria, IInternalTestRunEventsHandler eventHandler) in /_/src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyExecutionManager.cs:line 184

Test Run Aborted.

System.IO.FileNotFoundException: Could not find 'mono' host. Make sure that 'mono' is installed on the machine and is available in PATH environment variable.

at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Helpers.DotnetHostHelper.GetMonoPath() in /_/src/Microsoft.TestPlatform.CoreUtilities/Helpers/DotnetHostHelper.cs:line 93

at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Hosting.DefaultTestHostManager.GetTestHostProcessStartInfo(IEnumerable`1 sources, IDictionary`2 environmentVariables, TestRunnerConnectionInfo connectionInfo) in /_/src/Microsoft.TestPlatform.TestHostProvider/Hosting/DefaultTestHostManager.cs:line 219

at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Client.ProxyOperationManager.SetupChannel(IEnumerable`1 sources, String runSettings) in /_/src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyOperationManager.cs:line 229

Canceling since a higher priority waiting request for 'pr @ lahma:update-libs' exists

Target "Compile" has thrown an exception

The operation was canceled.

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

Attempting second-chance registration of MSBuild after RegisterDefaults failed

Could not register MSBuild: "Could not load file or assembly 'System.Runtime, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. "