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Why can I not uninstall this package?

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  Why can I not uninstall this package? Tim Woodall <debianuser@woodall.me.uk> - 2021-11-19 19:30 +0100
    Re: Why can I not uninstall this package? The Wanderer <wanderer@fastmail.fm> - 2021-11-19 19:40 +0100
      Re: Why can I not uninstall this package? The Wanderer <wanderer@fastmail.fm> - 2021-11-19 19:50 +0100

#242256 — Why can I not uninstall this package?

I have an old eeepc that I've just upgraded to bullseye. It was getting
very limited on diskspace so I've been going through removing packages
that I no longer require or in some cases, appear to be very old
versions that have been left lying around.

I've now got things under control. However I've hit the following weird
case that I don't understand:

eeepc:/var/lib/dpkg/info# apt-get remove libjbig0
Reading package lists... Done
Building dependency tree... Done
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:
  libreoffice-base-core : Depends: libreoffice-core-nogui (= 1:7.0.4-4+deb11u1) but it is not going to be installed or
                                   libreoffice-core (= 1:7.0.4-4+deb11u1) but it is not going to be installed
  python3-uno : Depends: libreoffice-core-nogui (= 1:7.0.4-4+deb11u1) but it is not going to be installed or
                         libreoffice-core (= 1:7.0.4-4+deb11u1) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be
caused by held packages.


This makes no sense to me. apt rdepends libjbig0 lists a handful of
packages none of which I have installed.

libreoffice-core is installed (and the version that is being asked for)

If I remove python3-uno then that problem goes away (until I reinstall
it). I don't want to uninstall libreoffice-base-core.

I haven't yet tried using dpkg to remove the package.

How can I debug what has gone wrong here?

This is a very old debian install that has been updated over the years.
The oldest files I still see in /var/lib/dpkg/info are:
-rw-r--r-- 1 root root     249 Mar 25  2010 libvolume-id0.list
-rw-r--r-- 1 root root     290 Aug 25  2009 libvolume-id0.md5sums
-rwxr-xr-x 1 root root     135 Aug 25  2009 libvolume-id0.postinst
-rwxr-xr-x 1 root root     132 Aug 25  2009 libvolume-id0.postrm
-rw-r--r-- 1 root root    2179 Aug 25  2009 libvolume-id0.symbols
-rw-r--r-- 1 root root      29 Apr 19  2009 libvolume-id0.shlibs

Tim.

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#242258

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On 2021-11-19 at 13:27, Tim Woodall wrote:

> I have an old eeepc that I've just upgraded to bullseye. It was getting
> very limited on diskspace so I've been going through removing packages
> that I no longer require or in some cases, appear to be very old
> versions that have been left lying around.
> 
> I've now got things under control. However I've hit the following weird
> case that I don't understand:
> 
> eeepc:/var/lib/dpkg/info# apt-get remove libjbig0
> Reading package lists... Done
> Building dependency tree... Done
> 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:
>   libreoffice-base-core : Depends: libreoffice-core-nogui (= 1:7.0.4-4+deb11u1) but it is not going to be installed or
>                                    libreoffice-core (= 1:7.0.4-4+deb11u1) but it is not going to be installed
>   python3-uno : Depends: libreoffice-core-nogui (= 1:7.0.4-4+deb11u1) but it is not going to be installed or
>                          libreoffice-core (= 1:7.0.4-4+deb11u1) but it is not going to be installed
> E: Error, pkgProblemResolver::Resolve generated breaks, this may be
> caused by held packages.

The way to track down a problem like this is to start by adding the
specified "is not going to be installed" packages to the install command
line, with the exact specified versions, and repeat the command.

You'll either get a specific message explaining *why* the "is not going
to be installed" happened, or get more packages listed for "is not going
to be installed". If the latter, rinse and repeat. If the former, the
"why" message will probably help you figure out what needs to be done.

In this case, since you're starting out with a "remove" command rather
than an "install" command, you're going to want to reverse it for
simplicity's sake. That means the second command in the cycle will be
something like (a non-linewrapped version of):

# apt-get install libjbig0- libreoffice-core-nogui=1:7.0.4-4+deb11u1
libreoffice-core=1:7.0.4-4+deb11u1

The trailing '-' on the package name turns the install action into a
remove action for that specific package. You can also use a trailing '+'
to do the reverse, but as in this case you're going to be specifying
more install actions than remove actions, it makes more sense to do it
this way around.


You'll probably also want to make note of your manually-installed
package list before getting started, since this process will wind up
marking the packages you name as manually installed.

The manually-installed package list can be gotten by running

$ apt-mark showmanual

and if you redirect that into a file you'll have a copy for later reference.

-- 
   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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#242259

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On 2021-11-19 at 13:36, The Wanderer wrote:

> On 2021-11-19 at 13:27, Tim Woodall wrote:

>> The following packages have unmet dependencies:
>>   libreoffice-base-core : Depends: libreoffice-core-nogui (= 1:7.0.4-4+deb11u1) but it is not going to be installed or
>>                                    libreoffice-core (= 1:7.0.4-4+deb11u1) but it is not going to be installed
>>   python3-uno : Depends: libreoffice-core-nogui (= 1:7.0.4-4+deb11u1) but it is not going to be installed or
>>                          libreoffice-core (= 1:7.0.4-4+deb11u1) but it is not going to be installed
>> E: Error, pkgProblemResolver::Resolve generated breaks, this may be
>> caused by held packages.

> # apt-get install libjbig0- libreoffice-core-nogui=1:7.0.4-4+deb11u1
> libreoffice-core=1:7.0.4-4+deb11u1

Oops - I missed the "or". Drop the -nogui variant from that command
line, it should only get in the way.

-- 
   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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