I executed apt update as root, but I received this error message: AppStream cache update completed, but some metadata was ignored due to errors.
The bug has been fixed in
appstream package version
0.10.1, but the version that gets installed in Ubuntu 16.04 is
0.9.4 by default. Ubuntu 16.10 automatically receives the update as it’s provided in its standard repositories.
The updated package version with the bugfix for Ubuntu 16.04 however is only provided through the
xenial-backports repository, which has a lower priority than the others. This means it won’t upgrade to this version unless you manually specify it.
To enable the
xenial-backports repository in first place, follow How do I enable the “backports” repository? (but only enable the repository, you don’t need to modify the repo priority).
After that, upgrade to the version from
xenial-backports by typing:
sudo apt install appstream/xenial-backports
appstream package should be upgraded to version
$ appstreamcli --version AppStream CLI tool version: 0.10.1
Now force refreshing the cache data, you should no longer see any warning:
$ sudo appstreamcli refresh --force AppStream cache update completed successfully.