Maybe a red herring but I know libvirt was just upgraded, this displays in my libvirt log:   2018-10-14 14:16:54.067+0000: 6886: info : libvirt version: 4.8.0 2018-10-14 14:16:54.067+0000: 6886: info : hostname: noah 2018-10-14 14:16:54.067+0000: 6886: error : virGetUserID:1042 : invalid argument: Failed to parse user 'tss' 2018-10-14 14:16:54.068+0000: 6886: error : virGetGroupID:1125 : invalid argument: Failed to parse group 'tss'