[Observium] No graphs linux

Hi,

I am new to observium and after having multiple deploys I discovered that it works mostly really well, but on my linux machines it seems I have an error with drawing the graphs for memory, cpu and that...

Anyone got a tip where I should start (client/server side) I have no clue at this point :)

My esxi works, my cisco works, but no linux... :|

Cheers,

Tamino