Well, expect that 406 and Range have nothing to do with each other. 416
is an out-of-range request, while 406 tells us that we requested a file
in a specific encoding which the server did not have.

The 416 Range thing should be handled for a while now, we at least have a 
testcase covering it so I would be interested in how to reproduce it still in 
apt versions >= 0.9.12 (disclaimer: I wrote both, the patch and the test).
[well, expect that as mentioned in #20 we would try to range a bz2 with an 
incomplete xz, but that could change with other reorganisations soon and more 
importantly, is pretty unlikely to have practical effect as compression formats 
do not appear and disappear at random from mirrors…]. A proper server shouldn't 
sent us a 416 here anyway, as we sent an If-Range btw as detailed in the HTTP 
RFC, but if we get it anyhow, we drop the partial file we have and do the 
request again without a range.

Regarding 406: We send an Accept header only if we request an
uncompressed file (to prevent servers from content negotiating us a
compressed file we do not support…), which is the last one we would try
and usually doesn't exist (expect on your own localnet mirrors), so a
failure is expected and the problem is more that your mirror doesn't
have the compressed files we asked for before…

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https://bugs.launchpad.net/bugs/940825

Title:
  apt-get update reporting "not acceptable"

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