I can't reproduce on a clean xenial/artful upgrade path on amd64, maybe
something has changed on your system, preventing the upgrade to succeed.
In any case, now artful is mostly EOL.
** Changed in: libpng1.6 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1737309
Title:
package libpng16-16 1.6.20-2 failed to install/upgrade: trying to
overwrite shared '/usr/share/doc/libpng16-16/ANNOUNCE', which is
different from other instances of package libpng16-16:amd64
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