Error upgrading to 5.2

[Rob Cranfill]

Trying to go from 5.0.2 (I think) to 5.2, I get the following in my log (see below). Suggestions?

System: 

  rob@pi4:/etc/weewx $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Debian
  Description:    Debian GNU/Linux 12 (bookworm)
  Release:        12
  Codename:       bookworm

Been working fine for over a year with 5.0.2. :-]

Oct 14 17:08:55 pi4 systemd[1]: Started weewx.service - WeeWX.
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Initializing weewxd version 5.2.0
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Command line: /usr/share/weewx/weewxd.py /etc/weewx/weewx.conf
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Using Python: 3.13.1 (main, Dec 12 2024, 15:48:42) [GCC 12.2.0]
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Located at:   /usr/local/bin/python3
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: Platform:     Linux-6.12.34+rpt-rpi-v8-aarch64-with-glibc2.36
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: Locale:       'en_US.UTF-8'
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: Entry path:   /usr/share/weewx/weewxd.py
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: WEEWX_ROOT:   /etc/weewx
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: Config file:  /etc/weewx/weewx.conf
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: User module:  /etc/weewx/bin/user
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: Debug:        0
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: User:         weewx
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: Group:        weewx
Oct 14 17:08:56 pi4 weewxd[3538]: INFO __main__: Groups:       dialout www-data weewx
Oct 14 17:08:56 pi4 weewxd[3538]: INFO weewx.engine: Loading station type Vantage (weewx.drivers.vantage)
Oct 14 17:08:56 pi4 weewxd[3538]: ERROR weewx.engine: Import of driver failed: No module named 'serial' (<class 'ModuleNotFoundError'>)
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****  Traceback (most recent call last):
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****    File "/usr/share/weewx/weewx/engine.py", line 115, in setupStation
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****      self.console = loader_function(config_dict, self)
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****                     ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****    File "/usr/share/weewx/weewx/drivers/vantage.py", line 32, in loader
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****      return VantageService(engine, config_dict)
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****    File "/usr/share/weewx/weewx/drivers/vantage.py", line 2046, in __init__
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****      Vantage.__init__(self, **config_dict[DRIVER_NAME])
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****      ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****    File "/usr/share/weewx/weewx/drivers/vantage.py", line 536, in __init__
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****      self.port.openPort()
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****      ~~~~~~~~~~~~~~~~~~^^
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****    File "/usr/share/weewx/weewx/drivers/vantage.py", line 317, in openPort
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****      import serial
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****  ModuleNotFoundError: No module named 'serial'
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL __main__: Unable to load driver: No module named 'serial'
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL __main__:     ****  Exiting...
Oct 14 17:08:56 pi4 systemd[1]: weewx.service: Main process exited, code=exited, status=4/NOPERMISSION
Oct 14 17:08:56 pi4 systemd[1]: weewx.service: Failed with result 'exit-code'.

Seems like the error is 

Oct 14 17:08:56 pi4 weewxd[3538]: ERROR weewx.engine: Import of driver failed: No module named 'serial' (<class 'ModuleNotFoundError'>)

But I do think pyserial is installed:

rob@pi4:/etc/weewx $ pip install pyserial
Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Requirement already satisfied: pyserial in /home/rob/.local/lib/python3.13/site-packages (3.5)

[Rob Cranfill]

I should have mentioned I have been installing/upgrading via the "configure apt" method - not a .deb file, as detailed at https://weewx.com/docs/5.2/quickstarts/debian/.

 /r

[John Smith]

apt is still using a .deb file, but it looks like your missing the python serial module...

apt install python3-serial

On Wed, 15 Oct 2025 at 11:38, Rob Cranfill <robcr...@gmail.com> wrote:

I should have mentioned I have been installing/upgrading via the "install via apt" method - not a .deb file.

 /r

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[Rob Cranfill]

And my station is a Vangage VUE; the config section for that is, as it was before,

[Vantage]
    # This section is for the Davis Vantage series of weather stations.
   
    # Connection type: serial or ethernet
    #  serial (the classic VantagePro)
    #  ethernet (the WeatherLinkIP or Serial-Ethernet bridge)
    type = serial
   
    # If the connection type is serial, a port must be specified:
    #   Debian, Ubuntu, Redhat, Fedora, and SuSE:
    #     /dev/ttyUSB0 is a common USB port name
    #     /dev/ttyS0   is a common serial port name
    #   BSD:
    #     /dev/cuaU0   is a common serial port name
    port = /dev/ttyUSB0
    

[Rob Cranfill]

FYI, when I get "info", I see good stuff. So weewx can talk to the device OK. :-/

rob@pi4:/etc/weewx $ weectl device weewx.conf --info
Using configuration file weewx.conf
Using driver weewx.drivers.vantage.
Using Vantage driver version 3.6.3 (weewx.drivers.vantage)
Querying...
Davis Vantage EEPROM settings:
   
    CONSOLE TYPE:                   Vantage Vue
   
    CONSOLE FIRMWARE:
      Date:                         Feb  3 2015
      Version:                      4.18
   
    CONSOLE SETTINGS:
      Archive interval:             300 (seconds)
      Altitude:                     150 (foot)
      Wind cup type:                large
      Rain bucket type:             0.01 inches
      Rain year start:              1
      Onboard time:                 2025-10-14 18:08:22
     
    CONSOLE DISPLAY UNITS:
      Barometer:                    mbar
      Temperature:                  degree_F
      Rain:                         inch
      Wind:                         mile_per_hour
     
    CONSOLE STATION INFO:
      Latitude (onboard):           +47.6
      Longitude (onboard):          -122.3
      Use manual or auto DST?       AUTO
      DST setting:                  N/A
      Use GMT offset or zone code?  ZONE_CODE
      Time zone code:               4
      GMT offset:                   N/A
      Temperature logging:          LAST
       
    TRANSMITTERS:
      Channel   Receive   Retransmit  Repeater    Type
         1      active        N         NONE      iss
         2      inactive      N         NONE      (N/A)
         3      inactive      N         NONE      (N/A)
         4      inactive      N         NONE      (N/A)
         5      inactive      N         NONE      (N/A)
         6      inactive      N         NONE      (N/A)
         7      inactive      N         NONE      (N/A)
         8      inactive      N         NONE      (N/A)

    RECEPTION STATS:
      Total packets received:       9832
      Total packets missed:         15605
      Number of resynchronizations: 1
      Longest good stretch:         8
      Number of CRC errors:         5459
     
    BAROMETER CALIBRATION DATA:
      Current barometer reading:    30.032 inHg
      Altitude:                     150 feet
      Dew point:                    42 F
      Virtual temperature:          49 F
      Humidity correction factor:   1.8
      Correction ratio:             1.006
      Correction constant:          +0.000 inHg
      Gain:                         0.000
      Offset:                       -33.000
     
    OFFSETS:
      Wind direction:               +0 deg
      Inside Temperature:           +0.0 F
      Inside Humidity:              +0 %
      Outside Temperature:          +0.0 F
      Outside Humidity:             +0 %

[Rob Cranfill]

I think it's installed:

rob@pi4:/etc/weewx $ sudo apt install python3-serial
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
python3-serial is already the newest version (3.5-1.1).

[John Smith]

I'm not sure why weeWX can't find it then, but your initial post says it can't find it... Did you also upgrade to Trixie or something?

Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL weewx.engine:     ****  ModuleNotFoundError: No module named 'serial'
Oct 14 17:08:56 pi4 weewxd[3538]: CRITICAL __main__: Unable to load driver: No module named 'serial'

To view this discussion visit https://groups.google.com/d/msgid/weewx-user/4216ca1b-a17b-469c-959d-17e2df3347a2n%40googlegroups.com.

[Rob Cranfill]

No, still using Debian bookworm.

On Tuesday, October 14, 2025 at 6:19:23 PM UTC-7 John Smith wrote:

I'm not sure why weeWX can't find it then, but your initial post says it can't find it... Did you also upgrade to Trixie or something?

[Rob Cranfill]

All,

I'm reading the docs and trying the various debugging guides, and just got some good/different results by running weewxd in the foreground. A new error has popped up, perhaps a clue to what-all is going on.

One line of data collection shown, then two Python errors: importing Cheetah and PIL. Should I try installing these by hand? (I'll ignore the question of why they weren't already installed, either from my 5.0.2 weewx, or by the new installer.) 

...

93530461563, rain: 0.0, rainAlarm: 0.0, rainRate: 0.0, rxCheckPercent: 37.58333333333333, soilLeafAlarm1: 0.0, soilLeafAlarm2: 0.0, soilLeafAlarm3: 0.0, soilLeafAlarm4: 0.0, stormRain: 0.0, sunrise: 1760538540.0, sunset: 1760577600.0, txBatteryStatus: 0, usUnits: 1, wind_samples: 44.0, windchill: 46.1, windDir: None, windGust: 1.0, windGustDir: 0.0, windrun: 0.0, windSpeed: 0.0, windSpeed10: 0.0, yearET: 0.0, yearRain: 17.96

Traceback (most recent call last):

  File "/usr/share/weewx/weewx/reportengine.py", line 231, in run
    obj = weeutil.weeutil.get_object(generator)(
          ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/usr/share/weewx/weeutil/weeutil.py", line 1404, in get_object
    module = importlib.import_module(module_name)
  File "/usr/local/lib/python3.13/importlib/__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 1026, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/usr/share/weewx/weewx/cheetahgenerator.py", line 67, in <module>
    import Cheetah.Filters
ModuleNotFoundError: No module named 'Cheetah'

Traceback (most recent call last):

  File "/usr/share/weewx/weewx/reportengine.py", line 231, in run
    obj = weeutil.weeutil.get_object(generator)(
          ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/usr/share/weewx/weeutil/weeutil.py", line 1404, in get_object
    module = importlib.import_module(module_name)
  File "/usr/local/lib/python3.13/importlib/__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 1026, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/usr/share/weewx/weewx/imagegenerator.py", line 14, in <module>
    import weeplot.genplot
  File "/usr/share/weewx/weeplot/genplot.py", line 13, in <module>
    from PIL import Image, ImageDraw, ImageFont
ModuleNotFoundError: No module named 'PIL'

Followed by the same Cheetah error again.

Suggestions?

[Rob Cranfill]

Oh, and

rob@pi4:~ $ python3
Python 3.13.1 (main, Dec 12 2024, 15:48:42) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import serial
>>> import PIL

Traceback (most recent call last):

  File "<python-input-1>", line 1, in <module>
    import PIL

ModuleNotFoundError: No module named 'PIL'

>>> import Cheetah

Traceback (most recent call last):

  File "<python-input-2>", line 1, in <module>
    import Cheetah

ModuleNotFoundError: No module named 'Cheetah'

[vince]

You have some kind of non-standard legacy python installation.  Notice the path to python below ?

Oct 14 17:08:55 pi4 systemd[1]: Started weewx.service - WeeWX.
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Initializing weewxd version 5.2.0
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Command line: /usr/share/weewx/weewxd.py /etc/weewx/weewx.conf
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Using Python: 3.13.1 (main, Dec 12 2024, 15:48:42) [GCC 12.2.0]
Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Located at:   /usr/local/bin/python3

I suspect if you used /usr/bin/python3 it would work.

[Rob Cranfill]

On Wednesday, October 15, 2025 at 12:19:49 PM UTC-7 vince wrote:

You have some kind of non-standard legacy python installation.  Notice the path to python below ?

..

Oct 14 17:08:55 pi4 weewxd[3538]: INFO __main__: Located at:   /usr/local/bin/python3

I suspect if you used /usr/bin/python3 it would work.

Yes! That's got to be it. But I'm having trouble getting WeeWX to use the Python I want.

I start it with this service file:

rob@pi4:/etc/weewx $ cat /lib/systemd/system/weewx.service
# systemd service configuration file for WeeWX

# fixed after upgrade to WeeWX 5.2?
# using /usr/share/weewx/weewxd.py

[Unit]
Description=WeeWX
Documentation=https://weewx.com/docs
Requires=time-sync.target
After=time-sync.target
Wants=network-online.target
After=network-online.target

[Service]
# was: ExecStart=weewxd /etc/weewx/weewx.conf
ExecStart=/usr/bin/python3.11 /usr/share/weewx/weewxd.py /etc/weewx/weewx.conf
StandardOutput=null
StandardError=journal+console
RuntimeDirectory=weewx
RuntimeDirectoryMode=775
User=weewx
Group=weewx

[Install]

WantedBy=multi-user.target

 

wherein I specify the path to Python3.11 But in the logs, nothing has changed:

Oct 15 16:28:55 pi4 systemd[1]: Started weewx.service - WeeWX.
Oct 15 16:28:56 pi4 weewxd[615557]: INFO __main__: Initializing weewxd version 5.2.0
Oct 15 16:28:56 pi4 weewxd[615557]: INFO __main__: Command line: /usr/share/weewx/weewxd.py /etc/weewx/weewx.conf
Oct 15 16:28:56 pi4 weewxd[615557]: INFO __main__: Using Python: 3.13.1 (main, Dec 12 2024, 15:48:42) [GCC 12.2.0]
Oct 15 16:28:56 pi4 weewxd[615557]: INFO __main__: Located at:   /usr/local/bin/python3

If I use that ExecStart (/usr/bin/python3.11 /usr/share/weewx/weewxd.py /etc/weewx/weewx.conf) from the command line, it works fine.

Thoughts? I'll go read the "starting weewx" docs again.....

[Rob Cranfill]

Oh, and I modified weewxd.py thusly:

rob@pi4:/etc/weewx $ cat /usr/bin/weewxd
#!/bin/sh
app=weewxd.py

# Get the weewx location and interpreter.  Default to something sane, but
# look for overrides from the system defaults.
WEEWX_BINDIR=/usr/share/weewx
WEEWX_PYTHON=/usr/bin/python3.11
[ -r /etc/default/weewx ] && . /etc/default/weewx
exec "$WEEWX_PYTHON" $WEEWX_PYTHON_ARGS "$WEEWX_BINDIR/$app" "$@"

[Rob Cranfill]

Fixed!

I forgot to do systemctl daemon-reload !

Thanks, everyone!! 

  See my output at http://robcranfill.net/weather (for the Seasons skin) or http://robcranfill.net/weather/Crandard for my nice 20-foot GUI. :-)