Hello,

I've tried v3.7.1 on a laptop also running Ubuntu 16.04. It's a Dell 
Inspiron 3552 (Pentium N3700 - 4GB RAM).
Same error is logged. Attached.
I hope It can help.

Thank you.

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Apr 11 18:52:53 cicero kernel: [ 1948.938871] usb 1-2.3: new full-speed USB 
device number 7 using xhci_hcd
Apr 11 18:52:53 cicero kernel: [ 1949.043498] usb 1-2.3: New USB device found, 
idVendor=0fde, idProduct=ca08
Apr 11 18:52:53 cicero kernel: [ 1949.043515] usb 1-2.3: New USB device 
strings: Mfr=1, Product=2, SerialNumber=0
Apr 11 18:52:53 cicero kernel: [ 1949.043526] usb 1-2.3: Product: USB HID 
Bootloader
Apr 11 18:52:53 cicero kernel: [ 1949.043537] usb 1-2.3: Manufacturer: 
Microchip Technology Inc.
Apr 11 18:52:53 cicero mtp-probe: checking bus 1, device 7: 
"/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3"
Apr 11 18:52:53 cicero mtp-probe: bus: 1, device: 7 was not an MTP device
Apr 11 18:52:53 cicero kernel: [ 1949.129756] usbcore: registered new interface 
driver usbhid
Apr 11 18:52:53 cicero kernel: [ 1949.129761] usbhid: USB HID core driver
Apr 11 18:52:53 cicero kernel: [ 1949.181332] hid-generic 0003:0FDE:CA08.0002: 
hiddev0,hidraw1: USB HID v1.11 Device [Microchip Technology Inc. USB HID 
Bootloader] on usb-0000:00:14.0-2.3/input0
Apr 11 18:54:08 cicero weewx[10244]: engine: Initializing weewx version 3.7.1
Apr 11 18:54:08 cicero weewx[10244]: engine: Using Python 2.7.12 (default, Nov 
19 2016, 06:48:10) #012[GCC 5.4.0 20160609]
Apr 11 18:54:08 cicero weewx[10244]: engine: Platform 
Linux-4.8.0-46-generic-x86_64-with-Ubuntu-16.04-xenial
Apr 11 18:54:08 cicero weewx[10244]: engine: Locale is 
'LC_CTYPE=en_US.UTF-8;LC_NUMERIC=es_ES.UTF-8;LC_TIME=es_ES.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=es_ES.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=es_ES.UTF-8;LC_NAME=es_ES.UTF-8;LC_ADDRESS=es_ES.UTF-8;LC_TELEPHONE=es_ES.UTF-8;LC_MEASUREMENT=es_ES.UTF-8;LC_IDENTIFICATION=es_ES.UTF-8'
Apr 11 18:54:08 cicero weewx[10244]: engine: Using configuration file 
/home/weewx/weewx.conf
Apr 11 18:54:08 cicero weewx[10244]: engine: Loading station type WMR300 
(weewx.drivers.wmr300)
Apr 11 18:54:08 cicero weewx[10244]: wmr300: driver version is 0.18
Apr 11 18:54:08 cicero weewx[10244]: wmr300: usb info: pyusb_version=1.0.0b2
Apr 11 18:54:08 cicero weewx[10244]: wmr300: sensor map is {'outHumidity': 
'humidity_1', 'extraDewpoint6': 'dewpoint_7', 'windchill': 'windchill', 
'extraDewpoint4': 'dewpoint_5', 'rainRate': 'rain_rate', 'heatindex': 
'heatindex_1', 'inTemp': 'temperature_0', 'windGustDir': 'wind_gust_dir', 
'extraDewpoint2': 'dewpoint_3', 'extraDewpoint3': 'dewpoint_4', 
'extraDewpoint1': 'dewpoint_2', 'barometer': 'barometer', 'extraDewpoint7': 
'dewpoint_8', 'dewpoint': 'dewpoint_1', 'extraDewpoint5': 'dewpoint_6', 
'extraHumid6': 'humidity_7', 'pressure': 'pressure', 'extraHumid4': 
'humidity_5', 'extraHumid5': 'humidity_6', 'extraHumid2': 'humidity_3', 
'extraHumid3': 'humidity_4', 'extraHumid1': 'humidity_2', 'extraTemp6': 
'temperature_7', 'extraTemp7': 'temperature_8', 'extraTemp4': 'temperature_5', 
'extraTemp5': 'temperature_6', 'extraTemp2': 'temperature_3', 'extraTemp3': 
'temperature_4', 'extraTemp1': 'temperature_2', 'extraHeatindex3': 
'heatindex_4', 'extraHeatindex2': 'heatindex_3', 'extraHeatindex1': 
'heatindex_2', 'extraHeatindex7': 'heatindex_8', 'extraHeatindex6': 
'heatindex_7', 'extraHeatindex5': 'heatindex_6', 'extraHumid7': 'humidity_8', 
'extraHeatindex4': 'heatindex_5', 'windDir': 'wind_dir', 'outTemp': 
'temperature_1', 'windSpeed': 'wind_avg', 'inHumidity': 'humidity_0', 
'windGust': 'wind_gust'}
Apr 11 18:54:08 cicero kernel: [ 2023.854523] usb 1-2.3: reset full-speed USB 
device number 7 using xhci_hcd
Apr 11 18:54:08 cicero weewx[10244]: engine: StdConvert target unit is 0x1
Apr 11 18:54:08 cicero weewx[10244]: wxcalculate: The following values will be 
calculated: barometer=prefer_hardware, windchill=hardware, dewpoint=hardware, 
appTemp=prefer_hardware, rainRate=hardware, windrun=prefer_hardware, 
heatindex=hardware, maxSolarRad=prefer_hardware, humidex=prefer_hardware, 
pressure=prefer_hardware, inDewpoint=prefer_hardware, ET=prefer_hardware, 
altimeter=prefer_hardware, cloudbase=prefer_hardware
Apr 11 18:54:08 cicero weewx[10244]: wxcalculate: The following algorithms will 
be used for calculations: altimeter=aaNOAA, maxSolarRad=RS
Apr 11 18:54:08 cicero weewx[10244]: engine: Archive will use data binding 
wx_binding
Apr 11 18:54:08 cicero weewx[10244]: engine: Record generation will be 
attempted in 'hardware'
Apr 11 18:54:08 cicero weewx[10244]: engine: Using archive interval of 300 
seconds (specified in weewx configuration)
Apr 11 18:54:08 cicero weewx[10244]: manager: Created and initialized table 
'archive' in database 'weewx.sdb'
Apr 11 18:54:08 cicero weewx[10244]: manager: Created daily summary tables
Apr 11 18:54:08 cicero weewx[10244]: engine: Using binding 'wx_binding' to 
database 'weewx.sdb'
Apr 11 18:54:08 cicero weewx[10244]: manager: Starting backfill of daily 
summaries
Apr 11 18:54:08 cicero weewx[10244]: restx: StationRegistry: Registration not 
requested.
Apr 11 18:54:08 cicero weewx[10244]: restx: Wunderground: Posting not enabled.
Apr 11 18:54:08 cicero weewx[10244]: restx: PWSweather: Posting not enabled.
Apr 11 18:54:08 cicero weewx[10244]: restx: CWOP: Posting not enabled.
Apr 11 18:54:08 cicero weewx[10244]: restx: WOW: Posting not enabled.
Apr 11 18:54:08 cicero weewx[10244]: restx: AWEKAS: Posting not enabled.
Apr 11 18:54:08 cicero weewx[10244]: engine: Starting up weewx version 3.7.1
Apr 11 18:54:08 cicero weewx[10244]: wmr300: reading records since ******* N/A 
*******     (    N/A   )
Apr 11 18:54:08 cicero weewx[10244]: wmr300: usb failure: [Errno 110] Operation 
timed out
Apr 11 18:54:08 cicero weewx[10244]: engine: Caught WeeWxIOError: [Errno 110] 
Operation timed out
Apr 11 18:54:08 cicero weewx[10244]:     ****  Waiting 60 seconds then 
retrying...
Apr 11 18:55:09 cicero weewx[10244]: engine: retrying...
Apr 11 18:55:09 cicero weewx[10244]: engine: Using configuration file 
/home/weewx/weewx.conf
Apr 11 18:55:09 cicero weewx[10244]: engine: Loading station type WMR300 
(weewx.drivers.wmr300)
Apr 11 18:55:09 cicero weewx[10244]: wmr300: driver version is 0.18
Apr 11 18:55:09 cicero weewx[10244]: wmr300: usb info: pyusb_version=1.0.0b2
Apr 11 18:55:09 cicero weewx[10244]: wmr300: sensor map is {'outHumidity': 
'humidity_1', 'extraDewpoint6': 'dewpoint_7', 'windchill': 'windchill', 
'extraDewpoint4': 'dewpoint_5', 'rainRate': 'rain_rate', 'heatindex': 
'heatindex_1', 'inTemp': 'temperature_0', 'windGustDir': 'wind_gust_dir', 
'extraDewpoint2': 'dewpoint_3', 'extraDewpoint3': 'dewpoint_4', 
'extraDewpoint1': 'dewpoint_2', 'barometer': 'barometer', 'extraDewpoint7': 
'dewpoint_8', 'dewpoint': 'dewpoint_1', 'extraDewpoint5': 'dewpoint_6', 
'extraHumid6': 'humidity_7', 'pressure': 'pressure', 'extraHumid4': 
'humidity_5', 'extraHumid5': 'humidity_6', 'extraHumid2': 'humidity_3', 
'extraHumid3': 'humidity_4', 'extraHumid1': 'humidity_2', 'extraTemp6': 
'temperature_7', 'extraTemp7': 'temperature_8', 'extraTemp4': 'temperature_5', 
'extraTemp5': 'temperature_6', 'extraTemp2': 'temperature_3', 'extraTemp3': 
'temperature_4', 'extraTemp1': 'temperature_2', 'extraHeatindex3': 
'heatindex_4', 'extraHeatindex2': 'heatindex_3', 'extraHeatindex1': 
'heatindex_2', 'extraHeatindex7': 'heatindex_8', 'extraHeatindex6': 
'heatindex_7', 'extraHeatindex5': 'heatindex_6', 'extraHumid7': 'humidity_8', 
'extraHeatindex4': 'heatindex_5', 'windDir': 'wind_dir', 'outTemp': 
'temperature_1', 'windSpeed': 'wind_avg', 'inHumidity': 'humidity_0', 
'windGust': 'wind_gust'}
Apr 11 18:55:09 cicero kernel: [ 2084.742405] usb 1-2.3: reset full-speed USB 
device number 7 using xhci_hcd
Apr 11 18:55:09 cicero weewx[10244]: engine: StdConvert target unit is 0x1
Apr 11 18:55:09 cicero weewx[10244]: wxcalculate: The following values will be 
calculated: barometer=prefer_hardware, windchill=hardware, dewpoint=hardware, 
appTemp=prefer_hardware, rainRate=hardware, windrun=prefer_hardware, 
heatindex=hardware, maxSolarRad=prefer_hardware, humidex=prefer_hardware, 
pressure=prefer_hardware, inDewpoint=prefer_hardware, ET=prefer_hardware, 
altimeter=prefer_hardware, cloudbase=prefer_hardware
Apr 11 18:55:09 cicero weewx[10244]: wxcalculate: The following algorithms will 
be used for calculations: altimeter=aaNOAA, maxSolarRad=RS
Apr 11 18:55:09 cicero weewx[10244]: engine: Archive will use data binding 
wx_binding
Apr 11 18:55:09 cicero weewx[10244]: engine: Record generation will be 
attempted in 'hardware'
Apr 11 18:55:09 cicero weewx[10244]: engine: Using archive interval of 300 
seconds (specified in weewx configuration)
Apr 11 18:55:09 cicero weewx[10244]: engine: Using binding 'wx_binding' to 
database 'weewx.sdb'
Apr 11 18:55:09 cicero weewx[10244]: manager: Starting backfill of daily 
summaries
Apr 11 18:55:09 cicero weewx[10244]: restx: StationRegistry: Registration not 
requested.
Apr 11 18:55:09 cicero weewx[10244]: restx: Wunderground: Posting not enabled.
Apr 11 18:55:09 cicero weewx[10244]: restx: PWSweather: Posting not enabled.
Apr 11 18:55:09 cicero weewx[10244]: restx: CWOP: Posting not enabled.
Apr 11 18:55:09 cicero weewx[10244]: restx: WOW: Posting not enabled.
Apr 11 18:55:09 cicero weewx[10244]: restx: AWEKAS: Posting not enabled.
Apr 11 18:55:09 cicero weewx[10244]: engine: Starting up weewx version 3.7.1
Apr 11 18:55:09 cicero weewx[10244]: wmr300: reading records since ******* N/A 
*******     (    N/A   )
Apr 11 18:55:09 cicero weewx[10244]: wmr300: usb failure: [Errno 110] Operation 
timed out
Apr 11 18:55:09 cicero weewx[10244]: engine: Caught WeeWxIOError: [Errno 110] 
Operation timed out
Apr 11 18:55:09 cicero weewx[10244]:     ****  Waiting 60 seconds then 
retrying...
Apr 11 18:56:09 cicero weewx[10244]: engine: retrying...
Apr 11 18:56:09 cicero weewx[10244]: engine: Using configuration file 
/home/weewx/weewx.conf
Apr 11 18:56:09 cicero weewx[10244]: engine: Loading station type WMR300 
(weewx.drivers.wmr300)
Apr 11 18:56:09 cicero weewx[10244]: wmr300: driver version is 0.18
Apr 11 18:56:09 cicero weewx[10244]: wmr300: usb info: pyusb_version=1.0.0b2
Apr 11 18:56:09 cicero weewx[10244]: wmr300: sensor map is {'outHumidity': 
'humidity_1', 'extraDewpoint6': 'dewpoint_7', 'windchill': 'windchill', 
'extraDewpoint4': 'dewpoint_5', 'rainRate': 'rain_rate', 'heatindex': 
'heatindex_1', 'inTemp': 'temperature_0', 'windGustDir': 'wind_gust_dir', 
'extraDewpoint2': 'dewpoint_3', 'extraDewpoint3': 'dewpoint_4', 
'extraDewpoint1': 'dewpoint_2', 'barometer': 'barometer', 'extraDewpoint7': 
'dewpoint_8', 'dewpoint': 'dewpoint_1', 'extraDewpoint5': 'dewpoint_6', 
'extraHumid6': 'humidity_7', 'pressure': 'pressure', 'extraHumid4': 
'humidity_5', 'extraHumid5': 'humidity_6', 'extraHumid2': 'humidity_3', 
'extraHumid3': 'humidity_4', 'extraHumid1': 'humidity_2', 'extraTemp6': 
'temperature_7', 'extraTemp7': 'temperature_8', 'extraTemp4': 'temperature_5', 
'extraTemp5': 'temperature_6', 'extraTemp2': 'temperature_3', 'extraTemp3': 
'temperature_4', 'extraTemp1': 'temperature_2', 'extraHeatindex3': 
'heatindex_4', 'extraHeatindex2': 'heatindex_3', 'extraHeatindex1': 
'heatindex_2', 'extraHeatindex7': 'heatindex_8', 'extraHeatindex6': 
'heatindex_7', 'extraHeatindex5': 'heatindex_6', 'extraHumid7': 'humidity_8', 
'extraHeatindex4': 'heatindex_5', 'windDir': 'wind_dir', 'outTemp': 
'temperature_1', 'windSpeed': 'wind_avg', 'inHumidity': 'humidity_0', 
'windGust': 'wind_gust'}
Apr 11 18:56:09 cicero kernel: [ 2145.146248] usb 1-2.3: reset full-speed USB 
device number 7 using xhci_hcd
Apr 11 18:56:09 cicero weewx[10244]: engine: StdConvert target unit is 0x1
Apr 11 18:56:09 cicero weewx[10244]: wxcalculate: The following values will be 
calculated: barometer=prefer_hardware, windchill=hardware, dewpoint=hardware, 
appTemp=prefer_hardware, rainRate=hardware, windrun=prefer_hardware, 
heatindex=hardware, maxSolarRad=prefer_hardware, humidex=prefer_hardware, 
pressure=prefer_hardware, inDewpoint=prefer_hardware, ET=prefer_hardware, 
altimeter=prefer_hardware, cloudbase=prefer_hardware
Apr 11 18:56:09 cicero weewx[10244]: wxcalculate: The following algorithms will 
be used for calculations: altimeter=aaNOAA, maxSolarRad=RS
Apr 11 18:56:09 cicero weewx[10244]: engine: Archive will use data binding 
wx_binding
Apr 11 18:56:09 cicero weewx[10244]: engine: Record generation will be 
attempted in 'hardware'
Apr 11 18:56:09 cicero weewx[10244]: engine: Using archive interval of 300 
seconds (specified in weewx configuration)
Apr 11 18:56:09 cicero weewx[10244]: engine: Using binding 'wx_binding' to 
database 'weewx.sdb'
Apr 11 18:56:09 cicero weewx[10244]: manager: Starting backfill of daily 
summaries
Apr 11 18:56:09 cicero weewx[10244]: restx: StationRegistry: Registration not 
requested.
Apr 11 18:56:09 cicero weewx[10244]: restx: Wunderground: Posting not enabled.
Apr 11 18:56:09 cicero weewx[10244]: restx: PWSweather: Posting not enabled.
Apr 11 18:56:09 cicero weewx[10244]: restx: CWOP: Posting not enabled.
Apr 11 18:56:09 cicero weewx[10244]: restx: WOW: Posting not enabled.
Apr 11 18:56:09 cicero weewx[10244]: restx: AWEKAS: Posting not enabled.
Apr 11 18:56:09 cicero weewx[10244]: engine: Starting up weewx version 3.7.1
Apr 11 18:56:09 cicero weewx[10244]: wmr300: reading records since ******* N/A 
*******     (    N/A   )
Apr 11 18:56:09 cicero weewx[10244]: wmr300: usb failure: [Errno 110] Operation 
timed out
Apr 11 18:56:09 cicero weewx[10244]: engine: Caught WeeWxIOError: [Errno 110] 
Operation timed out
Apr 11 18:56:09 cicero weewx[10244]:     ****  Waiting 60 seconds then 
retrying...
Apr 11 18:57:09 cicero weewx[10244]: engine: retrying...
Apr 11 18:57:09 cicero weewx[10244]: engine: Using configuration file 
/home/weewx/weewx.conf
Apr 11 18:57:09 cicero weewx[10244]: engine: Loading station type WMR300 
(weewx.drivers.wmr300)
Apr 11 18:57:09 cicero weewx[10244]: wmr300: driver version is 0.18
Apr 11 18:57:09 cicero weewx[10244]: wmr300: usb info: pyusb_version=1.0.0b2
Apr 11 18:57:09 cicero weewx[10244]: wmr300: sensor map is {'outHumidity': 
'humidity_1', 'extraDewpoint6': 'dewpoint_7', 'windchill': 'windchill', 
'extraDewpoint4': 'dewpoint_5', 'rainRate': 'rain_rate', 'heatindex': 
'heatindex_1', 'inTemp': 'temperature_0', 'windGustDir': 'wind_gust_dir', 
'extraDewpoint2': 'dewpoint_3', 'extraDewpoint3': 'dewpoint_4', 
'extraDewpoint1': 'dewpoint_2', 'barometer': 'barometer', 'extraDewpoint7': 
'dewpoint_8', 'dewpoint': 'dewpoint_1', 'extraDewpoint5': 'dewpoint_6', 
'extraHumid6': 'humidity_7', 'pressure': 'pressure', 'extraHumid4': 
'humidity_5', 'extraHumid5': 'humidity_6', 'extraHumid2': 'humidity_3', 
'extraHumid3': 'humidity_4', 'extraHumid1': 'humidity_2', 'extraTemp6': 
'temperature_7', 'extraTemp7': 'temperature_8', 'extraTemp4': 'temperature_5', 
'extraTemp5': 'temperature_6', 'extraTemp2': 'temperature_3', 'extraTemp3': 
'temperature_4', 'extraTemp1': 'temperature_2', 'extraHeatindex3': 
'heatindex_4', 'extraHeatindex2': 'heatindex_3', 'extraHeatindex1': 
'heatindex_2', 'extraHeatindex7': 'heatindex_8', 'extraHeatindex6': 
'heatindex_7', 'extraHeatindex5': 'heatindex_6', 'extraHumid7': 'humidity_8', 
'extraHeatindex4': 'heatindex_5', 'windDir': 'wind_dir', 'outTemp': 
'temperature_1', 'windSpeed': 'wind_avg', 'inHumidity': 'humidity_0', 
'windGust': 'wind_gust'}
Apr 11 18:57:10 cicero kernel: [ 2205.609845] usb 1-2.3: reset full-speed USB 
device number 7 using xhci_hcd
Apr 11 18:57:10 cicero weewx[10244]: engine: StdConvert target unit is 0x1
Apr 11 18:57:10 cicero weewx[10244]: wxcalculate: The following values will be 
calculated: barometer=prefer_hardware, windchill=hardware, dewpoint=hardware, 
appTemp=prefer_hardware, rainRate=hardware, windrun=prefer_hardware, 
heatindex=hardware, maxSolarRad=prefer_hardware, humidex=prefer_hardware, 
pressure=prefer_hardware, inDewpoint=prefer_hardware, ET=prefer_hardware, 
altimeter=prefer_hardware, cloudbase=prefer_hardware
Apr 11 18:57:10 cicero weewx[10244]: wxcalculate: The following algorithms will 
be used for calculations: altimeter=aaNOAA, maxSolarRad=RS
Apr 11 18:57:10 cicero weewx[10244]: engine: Archive will use data binding 
wx_binding
Apr 11 18:57:10 cicero weewx[10244]: engine: Record generation will be 
attempted in 'hardware'
Apr 11 18:57:10 cicero weewx[10244]: engine: Using archive interval of 300 
seconds (specified in weewx configuration)
Apr 11 18:57:10 cicero weewx[10244]: engine: Using binding 'wx_binding' to 
database 'weewx.sdb'
Apr 11 18:57:10 cicero weewx[10244]: manager: Starting backfill of daily 
summaries
Apr 11 18:57:10 cicero weewx[10244]: restx: StationRegistry: Registration not 
requested.
Apr 11 18:57:10 cicero weewx[10244]: restx: Wunderground: Posting not enabled.
Apr 11 18:57:10 cicero weewx[10244]: restx: PWSweather: Posting not enabled.
Apr 11 18:57:10 cicero weewx[10244]: restx: CWOP: Posting not enabled.
Apr 11 18:57:10 cicero weewx[10244]: restx: WOW: Posting not enabled.
Apr 11 18:57:10 cicero weewx[10244]: restx: AWEKAS: Posting not enabled.
Apr 11 18:57:10 cicero weewx[10244]: engine: Starting up weewx version 3.7.1
Apr 11 18:57:10 cicero weewx[10244]: wmr300: reading records since ******* N/A 
*******     (    N/A   )
Apr 11 18:57:10 cicero weewx[10244]: wmr300: usb failure: [Errno 110] Operation 
timed out
Apr 11 18:57:10 cicero weewx[10244]: engine: Caught WeeWxIOError: [Errno 110] 
Operation timed out
Apr 11 18:57:10 cicero weewx[10244]:     ****  Waiting 60 seconds then 
retrying...

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