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I've added the Daily PPA (don't worry, I have another partition with a stable elementary, this is just for learning) and when I try to apt upgrade -f (or the same without the -f) I get the following error: 

 Reading package lists... Done
 Building dependency tree       
 Reading state information... Done
 Correcting dependencies... failed.
 The following packages have unmet dependencies:
 appstream-data-pantheon-icons : Depends: appstream-data-pantheon but it is not installed
 E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. E: Unable to correct dependencies

I've tried to apt install -f appstream-data-pantheon-icons :

appstream-data-pantheon-icons is already the newest version (0.3.0-0~11~ubuntu0.4.1).
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
appstream-data-pantheon-icons : Depends: appstream-data-pantheon but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

And then apt install -f appstream-data-pantheon:

The following NEW packages will be installed:
   appstream-data-pantheon
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
83 not fully installed or removed.
Need to get 0 B/66,1 kB of archives.
After this operation, 74,8 kB of additional disk space will be used.
(Reading database ... 181367 files and directories currently installed.)
Preparing to unpack .../appstream-data-pantheon_0.3.0-0~11~ubuntu0.4.1_all.deb ...
Unpacking appstream-data-pantheon (0.3.0-0~11~ubuntu0.4.1) ...
dpkg: error processing archive /var/cache/apt/archives/appstream-data-pantheon_0.3.0-0~11~ubuntu0.4.1_all.deb (--unpack):
 trying to overwrite '/usr/share/app-info/yaml/pantheon_xenial-main_amd64.yml.gz', which is also in package appstream-data-pantheon-loki-stable 0.4+r13~ubuntu0.4.1
Processing triggers for appstream (0.10.4-1~elementary0.4.1) ...
AppStream cache update completed successfully.
Errors were encountered while processing:
 /var/cache/apt/archives/appstream-data-pantheon_0.3.0-0~11~ubuntu0.4.1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

What do I do now?

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1 Answer 1

Reset to default
2

As you can see there is a conflict between two packages (appstream-data-pantheon and appstream-data-pantheon-loki-stable) that both want to install a file (/usr/share/app-info/yaml/pantheon_xenial-main_amd64.yml.gz).

You can try to (in this order, preferably):

  1. wait for the bug to be corrected :)

  2. remove the older package if you do not need it any more

    sudo apt autoremove appstream-data-pantheon-icons

  3. choose to overwrite the selected file

    sudo dpkg --install --force-overwrite /var/cache/apt/archives/appstream-data-pantheon_0.3.0-0~11~ubuntu0.4.1_all.deb
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3
  • I don't know why I need appstream or what it does. But what's the best approach, 2 or 3?
    – Maccer
    Dec 5, 2016 at 21:45
  • I would try 2 and 3 only if 2 does not work
    – lemonslice
    Dec 5, 2016 at 21:57
  • 1
    sudo apt autoremove appstream-data-pantheon-icons That did the trick. Thanks!
    – Maccer
    Dec 5, 2016 at 22:16

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