I don't think this had anything to do with the proxy server, in your
VarLogDistupgradeMainlog.txt we can see the following.
2016-03-11 11:11:20,169 DEBUG Marking 'ubuntu-desktop' for upgrade
2016-03-11 11:11:20,614 DEBUG Marking 'ubuntu-gnome-desktop' for upgrade
2016-03-11 11:11:21,256 DEBUG blacklist expr 'kubuntu-desktop' matches
'kubuntu-desktop-trinity'
2016-03-11 11:11:21,256 DEBUG The package 'kubuntu-desktop-trinity' is marked
for removal but it's in the removal blacklist
2016-03-11 11:11:21,305 ERROR Dist-upgrade failed: 'The package
'kubuntu-desktop-trinity' is marked for removal but it is in the removal
blacklist.'
2016-03-11 11:11:21,306 DEBUG abort called
You had multiple desktop meta packages installed which can be confusing
for the release-upgrader and the upgrade failed to calculate because of
kubuntu-desktop.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1556019
Title:
do-release-upgrade aborts
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