Ubuntu Docker Container update-ca-certificates: command not found

This is running a Docker Container using the official Ubuntu 14.04 The end result will be the same as this QA once I can get that command installed.

New to Ubuntu and such, trying to get a docker container to update certs that i am linking in using -v.

Tried to use dpkg -S update-ca-certificates as described in the link and a few other answers that seemed to point in the same general direction. but i end up getting this in the container

root@24b087e56f8e:/# apt-get install -y ca-certificates
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package ca-certificates

2 Questions

1. How do you find out what package a command is installed with?

2. What package do I need to install with my container to get update-ca-certificates working?

Solution 1:

PEBKAC

turns out you need to run apt-get update before you can install any other packages. After running the updates you can then apt-get install -y ca-certificates and this is the package that contains the command update-ca-certificates

Solution 2:

In Ubuntu Docker Container

1- apt-get update

2- apt-get install ca-certificates -y

3- update-ca-certificates

good luck.