Comment 3 for bug 1651182

Vlamimir, the new fail you can find by link:
https://product-ci.infra.mirantis.net/job/9.x.system_test.ubuntu.plugins.thread_separate_haproxy/153/

>>> (/Stage[main]/Galera/Package[percona-xtrabackup]/ensure) change from purged to present failed: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold -o APT::Get::AllowUnauthenticated=1 install percona-xtrabackup' returned 100: Reading package lists...