Please note that the proposed archive is explicitly for testing package upgrades before they go into xenial-updates (this one seemingly failed). If you do not want to participate in testing,do not enable the proposed repository in your software sources (note that it is off by default).
Please note that the proposed archive is explicitly for testing package upgrades before they go into xenial-updates (this one seemingly failed). If you do not want to participate in testing,do not enable the proposed repository in your software sources (note that it is off by default).