Hello Farmand, nice that you are trying PellMon and hope you are ok with English. You can answer in Danish if you like.
PellMon works on raspberry 2 (just faster...)
Technical explanation follows:
The error you see is because the official raspbian image has recently been updated to a new version (jessie), where the init system that is resposible for starting background services (like PellMon) has been totally reworked. As you see here
https://www.raspberrypi.org/downloads/raspbian/ the old wheezy based version is still available.
Everything is completely different (and hopefully better). But the new system (called systemd by the way) is supposed to be completely compatible with the old system (called sysV init), so in theory PellMon which is made to work with the sysV init system would just work. In practice there are always details... I have tested with the new raspbian jessie image and PellMon does work fine, but I had to make a change in the installation instructions:
This part:
# Start the daemons manually, or reboot
sudo service pellmonsrv start
sudo service pellmonweb start
# Add them to init so they are started at boot
sudo update-rc.d pellmonsrv defaults
sudo update-rc.d pellmonweb defaults
Causes the error you see, because now with the new systemd init system we have to run it the other way, like this:
# Add them to init so they are started at boot
sudo update-rc.d pellmonsrv defaults
sudo update-rc.d pellmonweb defaults
# Start the daemons manually, or reboot
sudo service pellmonsrv start
sudo service pellmonweb start
I have updated the system installation instructions with this change.
But as long as you have run these two lines (without errors from them):
sudo update-rc.d pellmonsrv defaults
sudo update-rc.d pellmonweb defaults
PellMon should start when you reboot your raspberry. The "Start the daemons manually" part is not necessary, you can also reboot to start them.
You should be able to browse to
http://ip_of_your_raspberry:8081 with any webbrowser in your network to see the webinterface or
http://localhost:8081 on the raspberry since you seem to have a monitor connected to it.
If not, can you re-run these two lines:
sudo update-rc.d pellmonsrv defaults
sudo update-rc.d pellmonweb defaults
and post the output?
Hope this helps, worst case you could start from scratch with the raspbian wheezy image, but I have not managed to find any other problems with the jessie image.