///

If you are using `pip` to install packages (it comes by default with Python), you should **upgrade** it to the latest version.

Many exotic errors while installing a package are solved by just upgrading `pip` first.

/// tip

You would normally do this **once**, right after you create the virtual environment.

///

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  The same problem could happen with custom plugins which have Pod/Add or Pod/Update in EventsToRegister,
  which is also solved with this PR, but only when the feature flag SchedulerQueueingHints is enabled. ([#122627](https://github.com/kubernetes/kubernetes/pull/122627), [@sanposhiho](https://github.com/sanposhiho)) [SIG Scheduling and Testing]

 - The 'kubeadm config upload' command...