apt-get has been failing to retrieve two files from German archive mirror de.archive.ubuntu.com for some days:
Hit http://de.archive.ubuntu.com saucy/universe amd64 Packages
Hit http://de.archive.ubuntu.com saucy/multiverse amd64 Packages
[...]
Err http://de.archive.ubuntu.com saucy/universe i386 Packages
406 Not Acceptable [IP: 141.30.13.20 80]
Err http://de.archive.ubuntu.com saucy/multiverse i386 Packages
406 Not Acceptable [IP: 141.30.13.20 80]
[...]
W: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/saucy/universe/binary-i386/Packages 406 Not Acceptable [IP: 141.30.13.20 80]
W: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/saucy/multiverse/binary-i386/Packages 406 Not Acceptable [IP: 141.30.13.20 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
Whom should I report this issue to?
Yes, you should report it. Just send a mail to [email protected] with the time, ip, and log of the problem that you were facing. Or drop by the irc channel at irc://irc.freenode.net/ubuntu-mirrors
You can also report a ticket visiting https://rt.ubuntu.com or sending a mail to [email protected].
Thanks to Benjamin Drung (OP) and Jorge Castro for pointing this out.
From the w3c page: