[preflight] Running pre-flight checks [WARNING FileExisting-ethtool]: ethtool not found in system path [WARNING FileExisting-socat]: socat not found in system path error execution phase preflight: [preflight] Some fatal errors occurred: [ERROR CRI]: container runtime is not running: output: time="2022-05-23T15:43:15+08:00" level=fatal msg="getting status of runtime: rpc error: code = Unimplemented desc = unknown service runtime.v1alpha2.RuntimeService" , error: exit status 1 [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...` To see the stack trace of this error execute with --v=5 or higher