I see the same problem, see
https://ubuntuforums.org/showthread.php?t=2411319&page=2&p=13834468#post13834468
apt-cache policy update-manager
update-manager:
Installed: 1:16.04.15
Candidate: 1:16.04.15
Version table:
*** 1:16.04.15 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386
Packages
100 /var/lib/dpkg/status
1:16.04.12 500
500 http://us.archive.ubuntu.com/ubuntu xenial-security/main amd64
Packages
500 http://us.archive.ubuntu.com/ubuntu xenial-security/main i386
Packages
1:16.04.3 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
500 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages
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https://bugs.launchpad.net/bugs/1813626
Title:
update-manager repeatedly asks for partial upgrade
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