Error saying Some index files failed to download Thet have been ignored or old ones used instead

Question

I'm trying to install ansible in my Jenkins using a docker image but I keep getting stuck with an error.

My Dockerfile:

FROM jenkins

USER root

RUN apt-get install -y software-properties-common
RUN apt-add-repository ppa:ansible/ansible
RUN apt-get update
RUN apt-get install -y ansible

USER jenkins

Error:

W: Failed to fetch <repository-url> 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

Comments

The first two command in your Dockerfile is very specific to installing Ansible on Ubuntu. You don't seem to be using Ubuntu and hence the error. Either try using your base OS to Ubuntu or change your Dockerfile, something like this:

FROM jenkins
USER root
RUN apt-get update
RUN apt-get install -y ansible
USER jenkins

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Is it because of the blankline in the Dockerfile? Can we have them in our dockerfile?

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No Vardhan, It's not because of the Dockerfile. Dockerfiles are allowed to have blank spaces, they are just ignored during execution. I don't think @Laya is trying to install ansible on Ubuntu but her Dockerfile sure does contain commands which are specific to the base OS Ubuntu. It has nothing to do with blank lines in Dockerfile.