Build Fails with "Error:The process '/usr/bin/dotnet' failed with exit code 1" after adding "no-build:true" in the dotnet pack command - asp.net-core

Question

The CI pipeline works well if I remove the nobuild:true option from the DotNetCoreCLI#2 task to pack the Project (ie to create a NuGet package) but I am not able to understand what special except not building the project does the nobuild option brings.
I need not want to build the Project again as the Previous task have already build the Project and locked the Assembly version of DLLs generated. I want to use the same build to create the NuGet package and to do the same I need to pass the NoBuild option but doing the same breaks the pipeline.
The pipeline gives the error that the DLLs to be packed are not present at the specified location but I tried to look at the location and I could find the DLLs.One thing that confuses me is that though I have given nobuild to be true but still the tasks shows as Building the Project.
- task: DotNetCoreCLI#2
displayName: ".NET pack"
inputs:
command: pack
packagesToPack: ${{ parameters.packagesToPack }}
nobuild: true
versioningScheme: byEnvVar
versionEnvVar: CI_Version
packDirectory: $(build.artifactStagingDirectory)\${{ parameters.packTo }}
verbosityPack: 'Normal'
Its also important to note that the same thing( nobuild:true) works on Windows Agent but it fails on Ubuntu Agent.
PS: It could be a case where windows has upgraded the agent and has caused the issue. I searched over the issue and found that one has to lock the .net SDK in the build pipeline

Answer 1

Thanks for the other answers that may be related to the issue but things were already taken care.
The issue was only on the Linux Environment because of an issue in .NET SDK. Refer here
The error(DLLs could not be found in the path specified ) that was being generated was correct in somehow but also it was misleading. The DLLs were being generated in Release folder at the build stage and when I was packing the DLLs they were being searched in release folder.
Though Release and release remains the same in Windows Environment but Ubuntu being case sensitive generates the Error.
The SDK implementation of .Net Core missed the IgnoreCase in the Regex option and that caused the build to break on switchin to a Linux Agent.
DotnetBuild:
Dotnet Pack:
Solution: Define the folder where to generate the DLLs in the .csproj and the automatically build and pack step would pick the DLLs from there.

Answer 2

For this error NU5026 ,it refers to the project being packed has not been built yet and hence cannot be packed. Please view this reference.
The file ''F:\project\bin\Debug\net461\project.exe' to be packed was not found on disk.
According to your description, you canceled the automatic build before pack. There's possibility that your build task and pack task did't run with same configuration. For example, In dotnet build task, the project is automatically built with Debug configuration, and in the pack task you set the configuration as Release.
In dotnet build task, the project is automatically built with Debug configuration.
In the dotnet pack task , the default Configuration to Package is Release
If you do not cancel the automatic build before pack, in the .net pack task the project is built in Release configuration.
So please check the log of your build task and pack task, make sure the dotnet build command and dotnet pack command use the same configuration.