munin "unbound plugin" does not work

[idanka]

1) Ubuntu 18.04.2 LTS
2) install munin munin-node munin-plugins-extra
   missing package but install libcgi-fast-perl libapache2-mod-fcgid
unbound plugin settings
cd /etc/munin/plugins
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_by_class
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_by_flags
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_by_opcode
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_by_rcode
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_by_type
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_histogram
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_hits
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_memory
ln -s /usr/share/munin/plugins/unbound_munin_ /etc/munin/plugins/unbound_munin_queue

add plugin settings "nano /etc/munin/plugin-conf.d/plugins.conf"

[unbound*]
user root
env.statefile /var/lib/munin-node/plugin-state/unbound-state
env.unbound_conf /etc/unbound/unbound.conf
env.unbound_control /usr/sbin/unbound-control

3) munin missing dns graph

4) munin-run unbound_munin_by_type
/etc/munin/plugins/unbound_munin_by_type: 153: /etc/munin/plugins/unbound_munin_by_type: cannot create /var/lib/munin-node/plugin-state/unbound-state.lock: Directory nonexistent
/etc/munin/plugins/unbound_munin_by_type: 165: /etc/munin/plugins/unbound_munin_by_type: cannot create /var/lib/munin-node/plugin-state/unbound-state: Directory nonexistent
error retrieving data from unbound server

Settings sample:
* https://nlnetlabs.nl/documentation/unbound/howto-statistics/
* https://angristan.xyz/configure-unbound-plugin-munin/

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: munin-node 2.0.37-1ubuntu0.1
ProcVersionSignature: Ubuntu 5.0.0-21.22~18.04.1-generic 5.0.15
Uname: Linux 5.0.0-21-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jul 26 18:33:23 2019
InstallationDate: Installed on 2019-06-28 (27 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
SourcePackage: munin
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.munin.plugin-conf.d.munin-node: [deleted]