This problem only seems to affect Kubuntu upgrades, where the graphical
frontend 'DistUpgradeViewKDE' is used.
If the text mode upgrade is used (e.g. 'do-release-upgrade -d') the
release notes are not shown at all. Also if the GTK graphical frontend
is used (e.g. 'do-release-upgrade -d --frontend=DistUpgradeViewGtk3')
there is no problem, the release notes are correctly downloaded and
shown. But with the KDE frontend ('do-release-upgrade -d
--frontend=DistUpgradeViewKDE' or 'kubuntu-devel-release-upgrade'), the
HTTP request is made with an illegal URI containing a space. In presence
of a strict firewall that request may be dropped, and the upgrade
doesn't proceed.
The reason why the GTK frontend works is that the invalid URI is passed
to WebKit, which "fixes" the URI, i.e. encodes the space in the URI as
%20 before sending the HTTP request to the server. With the KDE
frontend, however, the URI is passed to python's
urllib.request.urlopen() function, which doesn't "fix" the URI, i.e. the
HTTP request is made with the illegal URI containing a space (coming
from the version string '16.04 LTS', i.e. this problem only affects
upgrades to LTS releases).
I believe this is a bug in MetaRelease.py which produces the
'dist.releaseNotesHtmlUri' but doesn't encode it properly for use as an
URI.
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https://bugs.launchpad.net/bugs/1561215
Title:
Upgrade to 16.04 blocked by firewall due to HTTP violation
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