Comment 1 for bug 836419

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Martin Pool (mbp) wrote : Re: badsig error on update from private ppa

some debugging in apt:

 - this is over https so there should be no proxy in the way
 - it is getting a 200 response for the gpg file with the correct size (316 bytes)
 - it's sending a conditional request for the Release file:

User-Agent: Debian APT-CURL/1.0 (0.8.16~exp5ubuntu6)
Host: private-ppa.launchpad.net
Accept: */*
If-Modified-Since: Sun, 28 Aug 2011 23:03:31 GMT
Cache-Control: max-age=0

... and getting a not-modified response.

deleting the 0-byte file from my cache gets things unjammed.

So, I'm not sure:
 * if, perhaps as part of bug 807303, Launchpad is ever disconnected before serving the files, things could be getting stuck here
 * conversely perhaps it's a bug in apt that it's caching a failed download, or not using a stronger cache validator