Hi again
I got it, problem is with package icu-devtools.
I uninstalled it and upgade works!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Fix Committed
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Public bug reported:
I can't do upgrade to 18.04, i don't know why, still have this error.
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release ve