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Title: When TRY updating 3rd party software, it wrote me error like" Instalation of packages from non-prooven sources; this action require installation from non-prooven sources" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/818507/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
