Not Able to execute kubectl command in jenkins pipeline

Not able to run Kubectl command in jenkins pipeline, But works fine through command line.

I am running a pipeline on ec2 ubuntu instance where I have installed jenkins and at the end it deploys the app to an eks cluster (ec2 is connected to cluster). Everything is happening from my main jenkins installation, I am not using any jenkins agents.

Ihave installed kubectl command on the ec2 instance using which I successfully connected to the eks cluster using normal cmd line. I am able to run the kubectl command from anywhere in the system. But when I run the kubectl apply -f . command in pipeline it says

kubectl apply -f deployment.yaml/var/lib/jenkins/workspace/java-app-ECR@tmp/durable-b43cd65c/script.sh: 4: kubectl: not found

Also my jenkins is executing the commands with the same user that I am using to execute the cmd line commands. When i give full path of the kubectl command in pipeline it says permission denied

/home/ubuntu/bin/kubectl apply -f deployment.yaml/var/lib/jenkins/workspace/java-app-ECR@tmp/durable-47c860e3/script.sh: 4: /home/ubuntu/bin/kubectl: Permission denied

but my user 'ubuntu' owns the files located in this path

ubuntu:~/bin$ pwd/home/ubuntu/binubuntu:~/bin$ lltotal 43996drwxrwxr-x  2 ubuntu ubuntu     4096 Jun 20 13:06 ./drwxr-x--- 12 ubuntu ubuntu     4096 Jun 20 13:06 ../-rwxrwxr-x  1    777 ubuntu 45039616 Jun 20 13:06 kubectl*

Tried this one How to setup kubectl within jenkins didnt help muchPlease guide