Comment 56 for bug 1719671

There is no trusty build of ubuntu-advantage-tools in trusty-proposed. Looks like it failed to build:
https://launchpadlibrarian.net/344718911/buildlog_ubuntu-trusty-i386.ubuntu-advantage-tools_10ubuntu0.14.04.1_BUILDING.txt.gz

The following packages have unmet dependencies:
 sbuild-build-depends-ubuntu-advantage-tools-dummy : Depends: flake8 but it is not installable or
                                                              python3-flake8 but it is not installable
E: Unable to correct problems, you have held broken packages.

Trusty has no flake8, but python3-flake8 is there. But in universe. Is that the problem? Then how did the other packages build, since flake8 is also in universe, in xenial, zesty and artful?