RIC Installation(https://docs.o-ran-sc.org/projects/o-ran-sc-ric-plt-ric-dep/en/latest/installation-guides.html) shell script is having k8s 1.16 which will not support now due to cloud package repository deprecation. Please find below post for your reference.

*https://kubernetes.io/blog/2023/08/31/legacy-package-repository-deprecation/
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"As stated in the announcement blog post, the new package repositories host packages for Kubernetes versions starting with v1.24.0. Earlier Kubernetes versions are not available in the new package repositories. Those old Kubernetes versions have reached end-of-life long time before introducing the new package repositories and we don't provide support for them any longer. Alternatively, you can use binaries directly or build packages on your own"