the list of packages that *does not* appear to give this issue: dpkg1

 (it gives another issue: 
It was not possible to authenticate some packages. This may be a 
transient network problem. You may want to try again later. See below 
for a list of unauthenticated packages. 

apt-transport-https 
apt-utils 
cups-filters-core-drivers 
libcwidget3 
libgl1-mesa-dri 
libgomp1 
libicu52 
libopenexr6 
libstdc++6 
libtag1-vanilla 
libtag1c2a 
libxapian22 
lshw 
qpdf 
)

** Attachment added: "dpkg1"
   
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1535475/+attachment/4552289/+files/dpkg1

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https://bugs.launchpad.net/bugs/1535475

Title:
  An unresolvable problem occurred from 14.04 to 15.10

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