Updating from xenial-proposed fixes the problem:
~# apt-cache policy lightdm lightdm: Installed: 1.18.2-0ubuntu2 Candidate: 1.18.2-0ubuntu2 Version table: *** 1.18.2-0ubuntu2 500 500 http://archive.ubuntu.com/ubuntu xenial-proposed/main i386 Packages 100 /var/lib/dpkg/status 1.18.2-0ubuntu1 500 500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages 1.18.1-0ubuntu1 500 500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages
Updating from xenial-proposed fixes the problem:
~# apt-cache policy lightdm archive. ubuntu. com/ubuntu xenial- proposed/ main i386 Packages dpkg/status 18.2-0ubuntu1 500 archive. ubuntu. com/ubuntu xenial-updates/main i386 Packages 18.1-0ubuntu1 500 archive. ubuntu. com/ubuntu xenial/main i386 Packages
lightdm:
Installed: 1.18.2-0ubuntu2
Candidate: 1.18.2-0ubuntu2
Version table:
*** 1.18.2-0ubuntu2 500
500 http://
100 /var/lib/
1.
500 http://
1.
500 http://