*** This bug is a duplicate of bug 1611737 ***
https://bugs.launchpad.net/bugs/1611737
I was able to find out that a ROS version was the problem. I
uninstalled ROS and then was able to upgrade.
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https://bugs.launchpad.net/bugs/1824860
Title:
unable to upgrade 16.04LTS to 18.04LTS
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