Comment 3 for bug 1366099

I was able to install munin onto both x86 and Power trusty versions:
  munin:
    charm: cs:trusty/munin-1
    exposed: false
    units:
      munin/0:
        agent-state: started
        agent-version: 1.22.1.1
        machine: "3"
        open-ports:
        - 80/tcp
        public-address: 10.0.3.74

Closing this as fixed.