If your intent is to delete all the objects in a namespace, but the command is not completing, emptying the namespace finalizer will often allow the deletion to finish.
For example, if you have tried deleting the “my-namespace” like below and it will not complete.
kubectl delete ns my-namespace --force --grace-period=0
Then as written by Ushakov Roman on stackoverflow, use jq to apply an empty finalizer to the kubectl replace command.
kubectl get ns my-namespace -o json | jq '.spec.finalizers = []' | kubectl replace --raw "/api/v1/namespaces/my-namespace/finalize" -f -
If you need to install jq, that can be done with apt on Ubuntu.
# install 'jq' utility sudo apt install -y jq
REFERENCES
stackoverflow, how to force delete a kubernetes namespace
NOTES
clearing finalizer for an object [link]
kubectl patch configmap/mymap \
--type json \
--patch='[ { "op": "remove", "path": "/metadata/finalizers" } ]'