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Re: Weirdness with two packages.........

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On 2016-11-28 at 01:10, Charlie wrote:

> On Mon, 28 Nov 2016 00:19:38 -0500 The Wanderer sent:
> 
> <snip>
> 
>> I have - different from your own:
>>> 
>>> $ apt-cache policy libavutil55
>>> libavutil55:
>>>   Installed: 10:3.1.2-dmo2
>>>   Candidate: 10:3.1.2-dmo2
>>>   Version table:
>>>  *** 10:3.1.2-dmo2 100
>>>         100 /var/lib/dpkg/status
>>>      7:3.2-2 500
>>>         500 http://ftp.us.debian.org/debian stretch/main amd64
>>> Packages  
>> 
>> This is almost certainly your problem. The version of libavutil which
>> you have is from a different source, with a higher epoch version but a
>> lower upstream version, and is no longer available from your selected
>> repositories. In particular, it is not the same version as your other
>> libav* libraries (as the snipped version information for libavformat
>> indicates), and that mismatch is probably the source of the problem.
>> 
>> Do you have any idea how this mismatched package version may have come
>> about?
>> 
>> I recommend that you explicitly install the "lower" version listed
>> here (7:3.2-2), and see if your problem goes away.
>> 
>> I don't know what tools you normally use for package installation and
>> upgrade, but I would do that with the following command (in a root
>> terminal):
>> 
>> apt-get install libavutil55=7:3.2-2
> 
> 	After contemplation, my reply is:
> 
> I'm on a different machine now, at a different place when sending this.
> 
> I only ever use apt-get for updates, upgrades, installs and purges.
> 
> But before I left that machine I attempted your excellent suggestion
> and received this error message:
> 
> The following packages have unmet dependencies:
>  libswresample2 : Depends: libavutil55 (>= 10:3.1.2) but 7:3.2-2 is to
> be installed
> E: Error, pkgProblemResolver::Resolve generated breaks, this may be
> caused by held packages.
> 
> I assume that I might have missed a bug report on a update/upgrade? So
> I will just have to purge libswresample2, and libavutil55 (>= 10:3.1.2)

Actually, it looks like libswresample2 has the same problem: the
installed version has a higher epoch but lower actual version.

My best guess is that at some point, you installed some package from a
different repository, which depended on these higher-epoch package
versions, and thus got them upgraded without upgrading the rest of your
libav* package ecosystem.

I would just add libswresample2 to your explicit-version install
command, and see what result you get. It may give further
unmet-dependencies errors; if you pursue the cascade far enough (I'd
advise checking each new package with 'apt-cache policy' to see
available versions before proceeding), you may be able to identify the
package(s) which depend or depended on the higher-epoch libav* packages
to begin with.

(Purging the libav* packages will probably result in trying to uninstall
various packages which depend on them, possibly including quite a few
things you may actually want. Although you could always do that and
reinstall the appropriate packages afterwards, "down"grading is almost
certainly the superior solution.)

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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Thread

Weirdness with two packages......... Charles Schroeder <ariestao1@ipstarmail.com.au> - 2016-11-28 01:10 +0100
  Re: Weirdness with two packages......... The Wanderer <wanderer@fastmail.fm> - 2016-11-28 03:30 +0100
    Re: Weirdness with two packages......... Charlie <ariestao1@ipstarmail.com.au> - 2016-11-28 04:20 +0100
      Re: Weirdness with two packages......... The Wanderer <wanderer@fastmail.fm> - 2016-11-28 06:30 +0100
        Re: Weirdness with two packages......... Charlie <ariestao1@ipstarmail.com.au> - 2016-11-28 07:20 +0100
          Re: Weirdness with two packages......... The Wanderer <wanderer@fastmail.fm> - 2016-11-28 13:30 +0100
            Re: Weirdness with two packages......... Charlie <ariestao1@ipstarmail.com.au> - 2016-11-28 13:50 +0100
              Re: Weirdness with two packages......... The Wanderer <wanderer@fastmail.fm> - 2016-11-28 14:10 +0100
        Re: Weirdness with two packages......... Charlie <ariestao1@ipstarmail.com.au> - 2016-11-28 13:30 +0100
          Re: Weirdness with two packages......... The Wanderer <wanderer@fastmail.fm> - 2016-11-28 13:50 +0100

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