Bug#1011072: Acknowledgement (munin-node fails to install with chown: invalid group: ‘root:munin’)

[Sandro]

I dug a little deeper and found that user and group are created by 
munin-common package. The postinst script first checks for the presence 
of user munin on the system:

        if ! getent passwd munin
Looks like the user was already present on my system prior to 
installation, albeit without a corresponding group (group id pointed to 
avahi). After deleting user munin manually, munin user and group where 
setup correctly. Thereafter, the postinst script of munin-node also 
works correctly.