root@libvhost:~# apt policy lxd
lxd:
  Installed: 2.0.10-0ubuntu1~16.04.2
  Candidate: 2.0.10-0ubuntu1~16.04.2
  Version table:
     2.18-0ubuntu3~16.04.2 100
        100 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
 *** 2.0.10-0ubuntu1~16.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.0.2-0ubuntu1~16.04.1 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
     2.0.0-0ubuntu4 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
root@libvhost:~# apt install lxd=2.18-0ubuntu3~16.04.2
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 lxd : Depends: lxd-client (= 2.18-0ubuntu3~16.04.2) but 2.0.10-0ubuntu1~16.04.2 is to be installed
E: Unable to correct problems, you have held broken packages.
root@libvhost:~# apt policy lxd-client
lxd-client:
  Installed: 2.0.10-0ubuntu1~16.04.2
  Candidate: 2.0.10-0ubuntu1~16.04.2
  Version table:
     2.18-0ubuntu3~16.04.2 100
        100 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
 *** 2.0.10-0ubuntu1~16.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.0.2-0ubuntu1~16.04.1 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
     2.0.0-0ubuntu4 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
root@libvhost:~#