I have the same problem on a fresh installation of pihole on a Raspberry Pi 2 with xbian. Debug log vgms91pny2
pihole-FTL doesn't want to be found and started, neither as a service nor as a program/script. pihole -r, reinstalling and changing permissions on /usr/bin/pihole-FTL didn't work. Do you have another suggestion about how I can get it to work, or does xbian miss some crucial parts which prevent FTL to start? Pihole does seem to start, but I'm not sure it's working correctly since the webinterface isn't telling me anything but "connection to api lost"