*** 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1767626 Title: cannot upgrade to bionic beaver 18.04 lts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1767626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs