>From the log of my upgrade below, you can clearly see that it says " *merging 
previous and distribution into /etc/weewx/weewx.conf*".
If I answer NO to replace my weewx.conf I expect the previous version's 
weewx.conf to be used, *untouched*. Instead, I found the station_type 
changed to simulator, all the rest was exactly the same.

Configuration file '/etc/weewx/weewx.conf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** weewx.conf (Y/I/N/O/D/Z) [default=N] ? N
Installing new version of config file /etc/weewx/weewx.conf.dist ...
saving previous config file as /etc/weewx/weewx.conf-4.1.1
saving distribution config file as /etc/weewx/weewx.conf-4.2.0
*merging previous and distribution into /etc/weewx/weewx.conf*
Using configuration file /etc/weewx/weewx.conf-4.1.1

On Sunday, November 1, 2020 at 1:28:54 AM UTC+1 Cameron D wrote:

> There may be a bit of confusion in this thread about "merging".  My 
> understanding and experience is that  with .DEB upgrades  there is no 
> automatic merging of config file changes.
> You run either with your old config or the new one.
>
> Every upgrade I do a manual check for changes and merge anything myself.
> One case is weewx.conf, which contains a version number, with the comment 
> "*do 
> not modify this*".
> So I modify it - such that my old config file matches the new version 
> number.
>
> Cameron.
>
> On Saturday, 31 October 2020 at 11:49:44 am UTC+10 [email protected] 
> wrote:
>
>> Hi Tom,
>>
>> I use ubuntu on an Intel NUC, with systemd, weewx 4.1 was installed as 
>> package.
>> I followed the upgrade guide, here was the result:
>>
>> The following packages will be upgraded:
>>   weewx
>> 1 upgraded, 0 newly installed, 0 to remove and 33 not upgraded.
>> Need to get 1.207 kB of archives.
>> After this operation, 47,1 kB of additional disk space will be used.
>> Get:1 http://weewx.com/apt/python3 buster/main all weewx all 4.2.0-1 
>> [1.207 kB]
>> Fetched 1.207 kB in 6s (195 kB/s)
>> Requesting to save current system state
>> Successfully saved as "autozsys_sgety6"
>> Preconfiguring packages ...
>> (Reading database ... 245196 files and directories currently installed.)
>> Preparing to unpack .../archives/weewx_4.2.0-1_all.deb ...
>> Unpacking weewx (4.2.0-1) over (4.1.1-1) ...
>> Setting up weewx (4.2.0-1) ...
>> Installing new version of config file 
>> /etc/weewx/skins/Seasons/current.inc ...
>> Installing new version of config file 
>> /etc/weewx/skins/Seasons/rss.xml.tmpl ...
>> Installing new version of config file /etc/weewx/skins/Seasons/seasons.js 
>> ...
>> Installing new version of config file 
>> /etc/weewx/skins/Standard/index.html.tmpl ...
>>
>> Configuration file '/etc/weewx/weewx.conf'
>>  ==> Modified (by you or by a script) since installation.
>>  ==> Package distributor has shipped an updated version.
>>    What would you like to do about it ?  Your options are:
>>     Y or I  : install the package maintainer's version
>>     N or O  : keep your currently-installed version
>>       D     : show the differences between the versions
>>       Z     : start a shell to examine the situation
>>  The default action is to keep your current version.
>> **** weewx.conf (Y/I/N/O/D/Z) [default=N] ? N*
>> Installing new version of config file /etc/weewx/weewx.conf.dist ...
>> saving previous config file as /etc/weewx/weewx.conf-4.1.1
>> saving distribution config file as /etc/weewx/weewx.conf-4.2.0
>> merging previous and distribution into /etc/weewx/weewx.conf
>> Using configuration file /etc/weewx/weewx.conf-4.1.1
>> *update-rc.d: error: unable to read /etc/init.d/weewx*
>> *dpkg: error processing package weewx (--configure):*
>> * installed weewx package post-installation script subprocess returned 
>> error exit status 1*
>> Processing triggers for systemd (245.4-4ubuntu3.2) ...
>> Errors were encountered while processing:
>>  weewx
>> ZSys is adding automatic system snapshot to GRUB menu
>> *E: Sub-process /usr/bin/dpkg returned an error code (1)*
>>
>> No big issue regarding the missing /etc/init.d/weewx I guessed, the big 
>> problem is that when weewx restarted I noticed totally wrong data.
>>
>> I quickly checked and compared the conf files, and I found out that 
>> *station_type 
>> = WeatherFlowUDP* was changed to *station_type = Simulator.*
>> I reverted it to the original value, but unfortunately I have 3-4 minutes 
>> of bad data in the db now, and I also sent it to some weather networks.
>>
>> Could this be due to the merging process of the conf files?
>> Is there a way I can fix the database removing those bad records?
>>
>> Thanks for any help on this.
>>
>> Alessandro
>>
>> On Tuesday, October 27, 2020 at 1:14:04 PM UTC+1 [email protected] wrote:
>>
>>> Some new features, fixes some bugs.
>>>
>>> See the *Upgrade Guide <http://www.weewx.com/docs/upgrading.htm>* for 
>>> instructions on how to upgrade.
>>>
>>> CHANGE LOG
>>>
>>> CHANGES COMING! This is the last release that will support the LaCrosse 
>>> WS23xx,
>>> Oregon WMR200 and WMR300 stations. In the future, they will be published as
>>> unsupported extensions.
>>>
>>> Made it easier to add new, derived types via StdWXCalculate. Fixes issue 
>>> #491.
>>>
>>> Changed the tag system slightly in order to make it possible for the XTypes
>>> system to add new aggregations that take an argument.
>>>
>>> Added the new data types in the extended_wview schema to the WeeWX types
>>> system. Fixes issue #613.
>>>
>>> Added ability to label left, right or both y-axes of graphs.  PR#610.
>>> Fixes issue #609. Thanks to user Brent Fraser!
>>>
>>> Added units and labels for the lightning data types.
>>>
>>> Fixed problem where threads attempt to access non-existent database. Fixes
>>> issue #579.
>>>
>>> Fixed problem that caused reporting units to revert to US if they were in a
>>> mixed unit system. Fixes issue #576.
>>>
>>> Fixed problem that could cause the station registry to fail if given a 
>>> location
>>> with a non-ASCII location name.
>>>
>>> Changed TE923 bucket size from 0.02589 inches to 1/36 of an inch
>>> (0.02777778 in). PR #575. Fixes issue #574. Thanks to user Timothy!
>>>
>>> Undocumented option retry_certificate has been renamed to retry_ssl, and now
>>> covers all SSL errors (not just certificate errors). Fixes issue #569. 
>>> Thanks
>>> to user Eric!
>>>
>>> Fixed problem caused by specifying a [Logging]/[[formatters]] section in
>>> weewx.conf that uses interpolated variables.
>>>
>>> Fixed problem in the Vantage driver that resulted in incorrect 
>>> sunrise/sunset
>>> being included in loop packets when run under Python 3. Thanks to users 
>>> Constantine and Jacques!
>>>
>>> Improved auto-scaling of plot axes.
>>>
>>> Fixed problem where aggregates of windvec and windgustvec returned the 
>>> aggregate
>>> since start of day, not the start of the aggregation period. Fixes issue 
>>> #590.
>>>
>>> New unit "beaufort", included in "group_speed". Treating beaufort as a 
>>> separate
>>> type has been deprecated. Fixes issue #591.
>>>
>>> New unit "kPa", included in "group_pressure". Fixes issue #596.
>>>
>>> Fixed bug in the simulator. Made it easier to subclass class Simulator.
>>>
>>> Expressions in StdCalibration are now ordered. Later corrections can depend 
>>> on
>>> earlier corrections.
>>>
>>> Fixed problem under Python 2, where option 'none' could cause exception.
>>> PR #597. Thanks to user Clément!
>>>
>>> Fixed problem with ws23xx driver under Python 3 that caused it to crash.
>>>
>>> Use a more modern formula for heat index. Fixes issue #601. Thanks to
>>> user Peter Q!
>>>
>>> Allow overriding the data binding when using iterators. Fixes issue #580.
>>>
>>> Fixed problem where old daily summaries may not have a version number.
>>>
>>> Fixed problem in WMR200 driver where missing UV reports as index 255.
>>>
>>> Added option 'force_direction' for working around a WU bug. Fixes issue 
>>> #614.
>>>
>>>

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