Your dialog comments says it all:
***
The following packages will be upgraded:
python3
1 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
12 not fully installed or removed.
******
That it; clean your system first: its easy via synaptic.
Does not forget to always purge the removed packages to avoid old settings left
behind, which can seriously disturb the system.
** Changed in: python3-defaults (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1682820
Title:
While upgrading to 17.04: package python3 3.5.1-4 failed to
install/upgrade: pre-dependency problem - not installing python3
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