Public bug reported:
An unresolvable problem occurred while calculating the upgrade.
This was likely caused by:
* Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge' from the ppa-purge
package to remove software from a Launchpad PPA and
try the upgrade again.
*** 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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