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* OS release: Ubuntu 16.04.1 LTS
* Package version: 3.168.3

For the past few days (maybe even weeks for other users), update-
notifier has been very repeatedly failing to handle the downloads for
ttf-mscorefonts-installer. Previously it was working fine on the same
system.

This seems to affect a lot of desktop users, but the issue is usually
misdiagnosed on forums because it is attributed to ttf-mscorefonts-
installer and not to update-notifier-common.

The issue is made particularly irritating because the update-notifier
cron job tries and fails and notifies users daily of this failure.

The issue can be reproduced by having ttf-mscorefonts-installer
installed, and running:

    sudo dpkg-reconfigure update-notifier-common

The error messages seem to be random but actually appear to be
consistent for a given download source:

* freefr.dl.sourceforge.net: 404  Not Found
* kent.dl.sourceforge.net: Protocol "http" not supported or disabled in libcurl
* netassist.dl.sourceforge.net: The HTTP server sent an invalid Content-Range 
header Bad header data [IP: 62.205.134.42 80]
* netcologne.dl.sourceforge.net: The HTTP server sent an invalid Content-Range 
header
* netix.dl.sourceforge.net: 404  Not Found
* vorboss.dl.sourceforge.net: 404  Not Found

In all above cases, the reported failing URL can be downloaded just fine
using wget.

Some other mirrors appear to work (unfortunately, mirror names are only
printed in case of errors). However, since ttf-mscorefonts-installer
triggers 11 downloads in a row, chances of randomly getting 11 working
mirrors are very low.

I am tagging this as regression-update because the issue started
happening when upgrading from 3.168.2 to 3.168.3 last Friday. It is of
course entirely possible the root cause is in another package, but this
would also likely be a regression-update, since I am very careful about
system-wide changes on this machine.

The previous update from 3.168.1 to 3.168.2 on November 4th went just
fine. ttf-mscorefonts-installer has been installed (just fine) on
September 26th, and not upgraded since then.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: regression-update
-- 
update-notifier / ttf-mscorefonts-installer download failure (regression)
https://bugs.launchpad.net/bugs/1655431
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