...Mono is required on Linux if your project targets the .NET Framework 4 or earlier. Read more about installing Mono here. Mono is not required if you target .NET Core 3.1, .NET 5 or .NET 6 on Linux. If you have issues running Chrome on Linux, the Puppeteer repo has a great troubleshooting guide. .NET Standard is a formal specification of .NET APIs that are available on multiple .NET implementations. The motivation behind .NET Standard was to establish greater uniformity in the .NET ecosystem. .NET 5 and later versions adopt a different approach to establishing uniformity that eliminates the need for .NET Standard in most scenarios.