Error from server (AlreadyExists): deployments.apps "ubuntu" already exists

Problem:

Haans-MacBook-Pro:istio-1.0.6 haanmo$ kubectl run -it ubuntu --image ubuntu:18.04 bash

kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.

Error from server (AlreadyExists): deployments.apps "ubuntu" already exists

Solution:
1. remove ubuntu image

kubectl delete deployment ubuntu

2. Run kubectl run -it ubuntu --image ubuntu:18.04 bash again

Haans-MacBook-Pro:istio-1.0.6 haanmo$ kubectl run -it ubuntu --image ubuntu:18.04 bash

kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.

If you don't see a command prompt, try pressing enter.

root@ubuntu-6d97966568-v6twd:/#

Ubuntu is removed and redeployed.

check
kubectl get deployment

Following Problems:
Error from server (AlreadyExists): deployments.apps "ubuntu" already exists is removed.
However, The other errors are not removed.