
The default behaviour of apt has been changed, see [0]. When using unsigned mirrors, we need to set the "trusted" option explicitly in order to allow updates from these. [0] https://manpages.debian.org/stretch/apt/apt-secure.8.en.html Depends-On: https://review.openstack.org/#/c/536615/ Change-Id: I1a6818b022cd34c8899179c36cae962a6c8ec5ed