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The piuparts upgrade test failed because dpkg detected a conffile as being modified and then prompted the user for an action. As there is no user input, this fails. But this is not the real problem, the real problem is that this prompt shows up in the first place, as there was nobody modifying this conffile at all, the package has just been installed and upgraded...
This is explained in detail in policy 10.7.3 at https://www.debian.org/doc/debian-policy/ch-files.html#behavior which says "[These scripts handling conffiles] must not ask unnecessary questions (particularly during upgrades), and must otherwise be good citizens."
According to the thread started at 200908191215.05079.holger@layer-acht.org these bugs are to be filed with severity serious.
The commandline to find these logs is:
COMMAND='grep -E "(EOF|end of file) on stdin at conffile prompt"'
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Quality Assurance
