*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

This is not a duplicate issue of bug #1611737 (ROS packages). It is not
even presenting the same error message. It is a libappstream issue.

I was able to find the resolution here:
https://askubuntu.com/questions/1051536/appstreamcli-appstream-system-
cache-was-updated-but-problems-were-found-metad?noredirect=1&lq=1

First I attempted to reinstall with 'sudo apt install --reinstall
libappstream2' because many are resolving the problem that way. My
attempt returned an error that the program could not be found.

Then I used 'sudo apt-get purge libappstream2' and it both uninstalled
whatever was there, then automatically installed the packages that were
needed.

I was then able to proceed successfully with my upgrade to 18.04.1, from
16.04

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https://bugs.launchpad.net/bugs/1767626

Title:
  cannot upgrade to bionic beaver 18.04 lts

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