Public bug reported:

Periodically I get emails from a machine with the subject:

Cron <root@Jenkins> if [ -x /etc/munin/plugins/apt_all ]; then
/etc/munin/plugins/apt_all update 7200 12 >/dev/null; elif [ -x
/etc/munin/plugins/apt ]; then /etc/munin/plugins/apt update 7200 12
>/dev/null; fi

And a body of:

AppStream cache update completed, but some metadata was ignored due to
errors.


I have a machine monitored by Munin.  One of the plugins used on that machine 
is /etc/munin/plugins/apt which periodically counts the number of packets that 
can be upgraded.  This is achieved by a crontab entry installed from the 
package which looks like this:

#
# cron-jobs for munin-node
#

MAILTO=root

# If the APT plugin is enabled, update packages databases approx. once
# an hour (12 invokations an hour, 1 in 12 chance that the update will
# happen), but ensure that there will never be more than two hour (7200
# seconds) interval between updates..
*/5 * * * *     root if [ -x /etc/munin/plugins/apt_all ]; then 
/etc/munin/plugins/apt_all update 7200 12 >/dev/null; elif [ -x 
/etc/munin/plugins/apt ]; then /etc/munin/plugins/apt update 7200 12 
>/dev/null; fi


For many months everything has been running smoothly.  On the 23rd November 
2016 I started getting the "AppStream cache update completed, but some metadata 
was ignored due to errors." messages at a rate of about ten a day.  


I did a quick Google search which turned up a handful of bugs from earlier this 
year, such as 
Bug1575248.  That is marked as Fixed Released though, so I am raising this new 
bug.

If there are any further diagnostic details I can provide, please let me
know.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: appstream 0.9.4-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Thu Nov 24 09:57:18 2016
InstallationDate: Installed on 2013-05-08 (1295 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130508)
JournalErrors:
 -- Logs begin at Wed 2016-11-23 19:25:01 GMT, end at Thu 2016-11-24 09:57:24 
GMT. --
 Nov 24 02:22:17 hostname systemd-tmpfiles[27330]: 
[/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
ProcEnviron:
 TERM=xterm-256color
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
SourcePackage: appstream
UpgradeStatus: Upgraded to xenial on 2016-08-24 (91 days ago)

** Affects: appstream (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to appstream in Ubuntu.
https://bugs.launchpad.net/bugs/1644498

Title:
  apt-get update returns "AppStream cache update completed, but some
  metadata was ignored due to errors." periodically

Status in appstream package in Ubuntu:
  New

Bug description:
  Periodically I get emails from a machine with the subject:

  Cron <root@Jenkins> if [ -x /etc/munin/plugins/apt_all ]; then
  /etc/munin/plugins/apt_all update 7200 12 >/dev/null; elif [ -x
  /etc/munin/plugins/apt ]; then /etc/munin/plugins/apt update 7200 12
  >/dev/null; fi

  And a body of:

  AppStream cache update completed, but some metadata was ignored due to
  errors.

  
  I have a machine monitored by Munin.  One of the plugins used on that machine 
is /etc/munin/plugins/apt which periodically counts the number of packets that 
can be upgraded.  This is achieved by a crontab entry installed from the 
package which looks like this:

  #
  # cron-jobs for munin-node
  #

  MAILTO=root

  # If the APT plugin is enabled, update packages databases approx. once
  # an hour (12 invokations an hour, 1 in 12 chance that the update will
  # happen), but ensure that there will never be more than two hour (7200
  # seconds) interval between updates..
  */5 * * * *     root if [ -x /etc/munin/plugins/apt_all ]; then 
/etc/munin/plugins/apt_all update 7200 12 >/dev/null; elif [ -x 
/etc/munin/plugins/apt ]; then /etc/munin/plugins/apt update 7200 12 
>/dev/null; fi

  
  For many months everything has been running smoothly.  On the 23rd November 
2016 I started getting the "AppStream cache update completed, but some metadata 
was ignored due to errors." messages at a rate of about ten a day.  

  
  I did a quick Google search which turned up a handful of bugs from earlier 
this year, such as 
  Bug1575248.  That is marked as Fixed Released though, so I am raising this 
new bug.

  If there are any further diagnostic details I can provide, please let
  me know.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: appstream 0.9.4-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
  Uname: Linux 4.4.0-47-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Thu Nov 24 09:57:18 2016
  InstallationDate: Installed on 2013-05-08 (1295 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130508)
  JournalErrors:
   -- Logs begin at Wed 2016-11-23 19:25:01 GMT, end at Thu 2016-11-24 09:57:24 
GMT. --
   Nov 24 02:22:17 hostname systemd-tmpfiles[27330]: 
[/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
  ProcEnviron:
   TERM=xterm-256color
   SHELL=/bin/bash
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   LANGUAGE=en_GB:en
  SourcePackage: appstream
  UpgradeStatus: Upgraded to xenial on 2016-08-24 (91 days ago)

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