I get the same message. Actually this message on my side comes from apt-get when using the jessie-backport repository:
root@nasty:~# grep -v ^# /etc/apt/sources.list deb http://ftp.de.debian.org/debian/ jessie-backports main contrib non-free root@nasty:~# apt-get update Hit http://ftp.de.debian.org jessie-backports InRelease Get:1 http://ftp.de.debian.org jessie-backports/main i386 Packages/DiffIndex [7,819 B] Get:2 http://ftp.de.debian.org jessie-backports/contrib i386 Packages/DiffIndex [229 B] Get:3 http://ftp.de.debian.org jessie-backports/non-free i386 Packages/DiffIndex [505 B] Get:4 http://ftp.de.debian.org jessie-backports/contrib Translation-en/DiffIndex [229 B] Get:5 http://ftp.de.debian.org jessie-backports/main Translation-en/DiffIndex [4,231 B] Get:6 http://ftp.de.debian.org jessie-backports/non-free Translation-en/DiffIndex [505 B] Hit http://ftp.de.debian.org jessie-backports/main i386 Packages 42% [Working]Falling back to normal index file acquire Ign http://ftp.de.debian.org jessie-backports/non-free i386 2015-07-15-1448.53.pdiff Ign http://ftp.de.debian.org jessie-backports/non-free i386 2015-07-16-2047.23.pdiff Hit http://ftp.de.debian.org jessie-backports/non-free i386 Fetched 13.5 kB in 0s (16.3 kB/s) Reading package lists… Done But this is only the case for i386 - for amd64 architecture I do not get this message. See also #793444 [1] Cheers, Unki [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=793444 -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org