This bug was fixed in the package autopkgtest - 3.20.6
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autopkgtest (3.20.6) unstable; urgency=medium
* Fix OSError when running a shell is requested but /dev/tty does not exist;
just log an error instead.
* Fix parsing of candidate versions from "apt-cache policy" to alway
http://anonscm.debian.org/cgit/autopkgtest/autopkgtest.git/commit/?id=b159a986b
** Changed in: autopkgtest (Ubuntu)
Status: Triaged => Fix Committed
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