Each supported operating system has a lifecycle defined by its sponsor organization (for example, Microsoft, Red Hat, or Apple). The .NET Core team applies each of those lifecycle schedules to inform adding and removing support for operating system versions.
The following support documents list currently supported operating system versions for supported .NET Core versions:
When an operating system version goes out of standard support, we stop testing that version and providing support for that version. This means that users will need to move forward to a supported operating system version to get support. Previously released packages will remain available for users needing access.
When a new operating system version is made available, we will typically support it on a subset of supported .NET Core versions, potentially only with the latest .NET Core version.