Unminimize Ubuntu

When I ssh to Jupyterhub, I get the following message:

This system has been minimized by removing packages and content that are
not required on a system that users do not log into.

To restore this content, you can run the 'unminimize' command.

This is probably the reason why bash-completion (and probably some other things) don't work.

I suppose inclusion of sudo unminimize to the Docker image would solve that, however, just running it on IO does not succeed because of read-only file system error for ssh.