Issue in running custom docker container for tacacs+

hi , i have used the below docker file to run TACACS+ on ubuntu 18.04. am seeing an error wherein tacacs+ is not starting with the conatiner. saying rc.d init run level not set. I tried all solutions in

and other similar posts. but still my application does not start. can you please let me know what could be the issue?

Use Base Ubuntu image

FROM ubuntu:18.04

Author of this Dockerfile

MAINTAINER Yamini Umapathy

Update & upgrades

RUN apt-get update && apt-get upgrade -y

Install tacacs+ and Google Authenticator

RUN apt-get install tacacs+ -y

Clear local repo

RUN apt-get clean

Copy tac_plus configuration file from host to the container

COPY tac_plus.conf /etc/tacacs+/tac_plus.conf

Run tac_plus as foreground process and use /etc/tacacas+/tac_plus.conf as the config file

CMD [“tac_plus”, “-G”, “-C”, “/etc/tacacs+/tac_plus.conf”]