Comment 0 for bug 1780520

I see the following in my logs several times a day:

  Jul 5 20:35:45 hostname fwupd[14510]: (fwupd:14510): Fu-WARNING **: FuMain: failed to load AppStream data: Failed to parse
/var/cache/app-info/xmls/fwupd.xml file: Erreur à la ligne 265 : L’entité ne se termine pas par un point-virgule ; vous avez probablement
utilisé une esperluette sans intention d’écrire une entité — échappez l’esperluette avec &
  Jul 5 20:36:07 hostname dbus[1044]: [system] Failed to activate service 'org.freedesktop.fwupd': timed out

and I get the following message when I run `apt update`:

  Réception de:18 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [67,7 kB]
  Réception de:19 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [68,0 kB]
  Réception de:20 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [107 kB]
  Réception de:21 http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [142 kB]
  1 841 ko réceptionnés en 1s (1 128 ko/s)
  AppStream cache update completed, but some metadata was ignored due to errors.

According to the fwupd author, this is a problem ib appstream-glib and the fix should be backported in 16.04:

  https://github.com/hughsie/fwupd/issues/565#issuecomment-402541089

There are also a number of reports on ask.ubuntu.com:

  https://askubuntu.com/questions/1051536/appstreamcli-appstream-system-cache-was-updated-but-problems-were-found-metad?noredirect=1&lq=1
  https://askubuntu.com/questions/943463/library-corruption-error-during-apt-get-update