The version itself is fine, but specifically listing Ubuntu as a system requirement is strange. If Ubuntu truly is a requirement, the name of the project should be "ProcMon for Ubuntu".
Presumably it isn't, and the README should list the actual requirements (kernel versions, etc.), with a note to the effect of "packages are available for Ubuntu LTS releases since 18.04".
Presumably it isn't, and the README should list the actual requirements (kernel versions, etc.), with a note to the effect of "packages are available for Ubuntu LTS releases since 18.04".