I installed HA with the “all in one installer” on Raspbian Lite.
often I added a new component to .yaml HA does not install the package. I see this in Errorlog.
16-11-12 13:12:21 homeassistant.bootstrap: Not initializing device_tracker.bluetooth_le_tracker because could not install dependency gattlib==0.20150805
Now I can install pygattlib manuell (with user hass?) and than, it seems to work.
…without knowing it for sure because I’m fairly new to HASS too, I suspect that HASS is trying to install missing stuff by itself. I noticed this behavior when HASS starts for the first time. There is a “deps” folder inside your profile directory that hosts certain Python packages. I guess this is the default location for those HASS-installed dependencies.