Well, I thought I had, but apparently not.  Talk about a rookie mistake! 
 (Doh!)  After the update, the python2 version updates properly to v4.1.1. 
 But, the python3 version (switched by 'wget -qO - 
http://weewx.com/apt/weewx-python3.list | sudo tee 
/etc/apt/sources.list.d/weewx.list', then another apt-get update) still 
gives me the same error message , as does an attempted install of 
python3-cheetah.

On Thursday, August 27, 2020 at 9:55:13 AM UTC-7 [email protected] wrote:

> Did you do a “sudo apt-get update”?
>
> On Aug 27, 2020, at 9:45 AM, 'loonsailor' via weewx-user <
> [email protected]> wrote:
>
> I'm trying to update my weewx installation.  When I use the python2 
> version, 'apt-get install weewx' gets me 'weewx is already the newest 
> version (3.8.0-1).'.  I know that we're up to 4.x.  So I try the python3 
> version.  That gets me the following:
>
>
>     $ sudo apt-get install weewx
>     Reading package lists... Done
>     Building dependency tree       
>     Reading state information... Done
>     Some packages could not be installed. This may mean that you have
>     requested an impossible situation or if you are using the unstable
>     distribution that some required packages have not yet been created
>     or been moved out of Incoming.
>     The following information may help to resolve the situation:
>     The following packages have unmet dependencies:
>       weewx : Depends: python3-cheetah but it is not installable
>       E: Unable to correct problems, you have held broken packages.
>
> I've tried to install Cheetah, but I get this:
>
>     $ sudo apt-get install python3-cheetah
>
>     Reading package lists... Done
>
>     Building dependency tree       
>
>     Reading state information... Done
>
>     Package python3-cheetah is not available, but is referred to by 
> another package.
>
>     This may mean that the package is missing, has been obsoleted, or
>
>     is only available from another source
>
>     E: Package 'python3-cheetah' has no installation candidate
>
> I did the alternate installation ('pip3 install cheetah3').  That 
> succeeds, but I still can't install a python3 version of weewx, with the 
> same error message. What am I missing?
>
> (ubuntu 18.04LTS, python v2.7.17, python3 v 3.6.9)
>
>
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