[Bug 1862216] Re: Unclear AppStream message in `update` output

[Matthias Klumpp]

*** This bug is a duplicate of bug 1872258 ***
    https://bugs.launchpad.net/bugs/1872258

** This bug is no longer a duplicate of bug 1861631
   "The AppStream system cache was updated, but some components were ignored. Refer to the verbose log for more information."
** This bug has been marked a duplicate of bug 1872258
   GS injects invalid metadata, causing "AppStream cache update completed, but some metadata was ignored"

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Title:
  Unclear AppStream message in `update` output

Status in apt package in Ubuntu:
  New

Bug description:
  When I run `apt update`, I see an AppStream message in the output:

  $ sudo apt update
  <snip>
  Fetched 42.5 MB in 15s (2,842 kB/s)                                                                                                                                                                               
  The AppStream system cache was updated, but some components were ignored. Refer to the verbose log for more information.
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  23 packages can be upgraded. Run 'apt list --upgradable' to see them.

  Even as an Ubuntu developer, I don't know what that means, so I would
  imagine most of our users won't either.  What effect will this have on
  me?  Is it something I should worry about?  Should I be looking at the
  verbose log whenever I see this message?  Where is the verbose log?

  I think this message could serve to see some improvement, to make it
  clearer to users what has happened and what their expected actions
  are.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: apt 1.9.8
  ProcVersionSignature: Ubuntu 5.4.0-13.16-generic 5.4.16
  Uname: Linux 5.4.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  CurrentDesktop: i3
  Date: Thu Feb  6 12:28:19 2020
  InstallationDate: Installed on 2019-05-07 (275 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  SourcePackage: apt
  UpgradeStatus: Upgraded to focal on 2019-11-15 (82 days ago)

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