/usr/share/perl5/Munin/ is in munin-node 1.4.6-3ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Munin/Node/
/usr/share/perl5/Munin/Node/Config.pm
/usr/share/perl5/Munin/Node/Configure/
/usr/share/perl5/Munin/Node/Configure/Debug.pm
/usr/share/perl5/Munin/Node/Configure/History.pm
/usr/share/perl5/Munin/Node/Configure/HostEnumeration.pm
/usr/share/perl5/Munin/Node/Configure/Plugin.pm
/usr/share/perl5/Munin/Node/Configure/PluginList.pm
/usr/share/perl5/Munin/Node/Logger.pm
/usr/share/perl5/Munin/Node/OS.pm
/usr/share/perl5/Munin/Node/SNMPConfig.pm
/usr/share/perl5/Munin/Node/Server.pm
/usr/share/perl5/Munin/Node/Service.pm
/usr/share/perl5/Munin/Node/Session.pm
/usr/share/perl5/Munin/Node/Utils.pm
/usr/share/perl5/Munin/Plugin/
/usr/share/perl5/Munin/Plugin.pm
/usr/share/perl5/Munin/Plugin/Pgsql.pm
/usr/share/perl5/Munin/Plugin/SNMP.pm