Comment 7 for bug 1557488

@Folks,

I propose to switch to snapshot usage, we need to ask CI-team to discuss and make decision which mirrors to use:
and probably re-define this variable MIRROR_UBUNTU

++ curl -sSf https://ci.fuel-infra.org/job/devops.master.env/lastSuccessfulBuild/artifact/mirror_ubuntu_data.txt
+ export 'MIRROR_UBUNTU=deb http://mirror.seed-cz1.fuel-infra.org/pkgs//ubuntu-latest/ trusty main universe multiverse|deb http://mirror.seed-cz1.fuel-infra.org/pkgs//ubuntu-latest/ trusty-updates main universe multiverse|deb http://mirror.seed-cz1.fuel-infra.org/pkgs//ubuntu-latest/ trusty-security main universe multiverse'
+ MIRROR_UBUNTU='deb http://mirror.seed-cz1.fuel-infra.org/pkgs//ubuntu-latest/ trusty main universe multiverse|deb http://mirror.seed-cz1.fuel-infra.org/pkgs//ubuntu-latest/ trusty-updates main universe multiverse|deb http://mirror.seed-cz1.fuel-infra.org/pkgs//ubuntu-latest/ trusty-security main universe multiverse'