I found out that adding "91.189.92.191 archive.canonical.com" to /etc/hosts works around the problem. For some reason the files are missing only on the server that's IP is 91.189.92.150 .
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to flashplugin-nonfree in Ubuntu. https://bugs.launchpad.net/bugs/1654511 Title: adobe-flashplugin_20161213.1.orig.tar.gz is missing Status in flashplugin-nonfree package in Ubuntu: Confirmed Bug description: I'm running Ubuntu 16.04.1. When I try to install the flashplugin- installer package (version 24.0.0.186ubuntu0.16.04.1), the post- install script tries to download the file http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe- flashplugin_20161213.1.orig.tar.gz. However, it fails with a 404 Not Found error every time. I'm not familiar with how Ubuntu packages the Flash plugin, so I don't know what that file is supposed to be or why it's missing. Here's the full error message: $ sudo apt install flashplugin-installer [...] Preparing to unpack .../flashplugin-installer_24.0.0.186ubuntu0.16.04.1_amd64.deb ... Unpacking flashplugin-installer (24.0.0.186ubuntu0.16.04.1) ... Processing triggers for update-notifier-common (3.168.3) ... flashplugin-installer: processing... flashplugin-installer: downloading http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_20161213.1.orig.tar.gz Err:1 http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_20161213.1.orig.tar.gz 404 Not Found [IP: 91.189.92.150 80] W: Can't drop privileges for downloading as file '/var/lib/update-notifier/package-data-downloads/partial/adobe-flashplugin_20161213.1.orig.tar.gz' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied) E: Failed to fetch http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_20161213.1.orig.tar.gz 404 Not Found [IP: 91.189.92.150 80] E: Download Failed [...] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/flashplugin-nonfree/+bug/1654511/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp