That version is now dead http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
** Changed in: lightdm (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1668527 Title: after locking the screen remains black forever. Status in lightdm package in Ubuntu: Invalid Bug description: after locking the screen remains black forever. ---- lsb_release -rd Description: Ubuntu Zesty Zapus (development branch) Release: 17.04 apt-cache policy lightdm lightdm: Installed: 1.21.5-0ubuntu1 Candidate: 1.21.5-0ubuntu1 Version table: *** 1.21.5-0ubuntu1 500 500 http://fi.archive.ubuntu.com/ubuntu zesty/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: lightdm 1.21.5-0ubuntu1 ProcVersionSignature: Ubuntu 4.10.0-8.10-generic 4.10.0-rc8 Uname: Linux 4.10.0-8-generic x86_64 ApportVersion: 2.20.4-0ubuntu2 Architecture: amd64 Date: Tue Feb 28 11:32:13 2017 InstallationDate: Installed on 2014-04-21 (1043 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) mtime.conffile..etc.pam.d.lightdm: 2016-04-16T15:45:25.000214 mtime.conffile..etc.pam.d.lightdm-greeter: 2016-04-16T15:45:05.232214 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1668527/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp