[mythtv-users] Trying to update, but have dependency problems

[Stephen Worthington]

On Wed, 21 Oct 2020 13:07:27 -0700, you wrote:

>Hi all -
>My combined BE/FE machine is running v31 on Ubuntu 18.04.
>While getting ready to update to 20.04, I ran into the following:
>
>Apparently Myth hasn't been able to update for a little while because of
>dependency issues.
>
>python3-future
>python3-requests-cache
>libminizip1
>minizip
>
>These no longer exist in Ubuntu's repositories.  Can someone tell me where
>I can find them?
>
>[rcs at vader: ~]$ sudo apt list --upgradeable
>Listing... Done
>libmyth-python/bionic 2:31.0+fixes.202010122044.eb3c84de5f~ubuntu18.04.1
>all [upgradable from: 2:30.0+fixes.202008021328.d1d647a~ubuntu18.04.1]
>mythgame/bionic 2:31.0+fixes.202010122044.eb3c84de5f~ubuntu18.04.1 amd64
>[upgradable from: 2:30.0+fixes.202002121942.ab250d6~ubuntu18.04.1]
>mythtv-common/bionic 2:31.0+fixes.202010122044.eb3c84de5f~ubuntu18.04.1
>amd64 [upgradable from: 2:30.0+fixes.202008021328.d1d647a~ubuntu18.04.1]
>mythweb/bionic 2:31.0+fixes.202010122044.eb3c84de5f~ubuntu18.04.1 all
>[upgradable from: 2:30.0+fixes.202008021328.d1d647a~ubuntu18.04.1]
>
>[rcs at vader:~]$ sudo apt install libmyth-python mythgame mythtv-common
>mythweb
>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:
> libmyth-python : Depends: python3-requests-cache but it is not installable
>                  Depends: python3-future but it is not installable
> mythgame : Depends: libminizip1 (>= 1.1) but it is not installable
>            Depends: minizip but it is not installable
> mythtv-common : Depends: python3-requests-cache but it is not installable
>                 Depends: python3-future but it is not installable
>E: Unable to correct problems, you have held broken packages.
>
>Python-future and python-request-cache (per apt-cache, apparently these are
>supposed to cover versions 2 and 3) are already installed, but apparently
>don't satisfy the dependencies.
>
>Thanks!
>Bob

I checked on the python3-future package at packages.ubuntu.com and it
does exist for 18.04.  But I got several error messages while using
the search on that web site.  I had to retry the searches until they
succeeded.  So I am wondering if the problem may be with the
downloading of the index files from the package servers, rather than
the packages not being there.  If you manually run "apt update", do
you get any errors?  You might also like to try apt's repair command:

apt install --fix-broken