I have been running my Garmin under FreeBSD for a few years, and it's been working great. So I recently had to shift to Ubuntu Linux 16.04, and honestly thought it would be easy to plug everything in and just make it happy. Reading the various docs for Ubuntu 16.04 LTS, it says all of the modules are built and loaded, and an lsmod shows this is the case. # lsmod|grep pps pps_ldisc 16384 1 pps_core 20480 1 pps_ldisc So it looks ready to roll. I then hooked up the garmin, I use the serial line for pps, and power it from a USB port, and figured it would probably sync up, but no such love. I have tried using the NEMA driver, enabling PPS, and I even tried using the NEMA driver with the PPS driver (.22) added in as well, but no love. The ntptime command just never shows anything to do with pps: ntp_gettime() returns code 0 (OK) time db34fdf6.b3f1c758 Sat, Jul 16 2016 14:39:50.702, (.702908970), maximum error 464140 us, estimated error 17306 us, TAI offset 0 ntp_adjtime() returns code 0 (OK) modes 0x0 (), offset 53253.096 us, frequency -6.870 ppm, interval 1 s, maximum error 464140 us, estimated error 17306 us, status 0x2001 (PLL,NANO), time constant 9, precision 0.001 us, tolerance 500 ppm, Here is my current configuration, and I have even tried various iterations as you will see from the stuff commented out: # Try and get GPS/USB Time Going # #server 127.127.20.0 mode 1 prefer #fudge 127.127.20.0 flag1 1 flag2 0 flag3 1 time2 0.800 ## #server 127.127.20.0 mode 0 minpoll 4 maxpoll 4 prefer #fudge 127.127.20.0 flag1 1 flag2 0 flag3 1 time2 0.600 # server 127.127.20.0 mode 16 minpoll 3 prefer fudge 127.127.20.0 flag1 1 flag2 1 flag3 1 time1 0.0 # #server 127.127.22.0 # ATOM(PPS) #fudge 127.127.22.0 flag3 1 # enable PPS module #pps /dev/pps0 assert hardpps # Does anyone have any ideas, or have this all working under Ubuntu 16.04 LTS? I would sure love to get my time server back online, as I pretty much have everything on the network sync with it.. --- Howard Leadmon