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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