:~# apt-mark showhold
docker-ce
:~# apt-get install docker-ce=17.06.2~ce-0~debian
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following held packages will be changed:
  docker-ce
The following packages will be DOWNGRADED:
  docker-ce
0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 0 not upgraded.
Need to get 0 B/20.6 MB of archives.
After this operation, 3285 kB disk space will be freed.
Do you want to continue? [Y/n] y
dpkg: warning: downgrading docker-ce from 17.09.0~ce-0~debian to 17.06.2~ce-0~debian
(Reading database ... 70221 files and directories currently installed.)
Preparing to unpack .../docker-ce_17.06.2~ce-0~debian_amd64.deb ...
Unpacking docker-ce (17.06.2~ce-0~debian) over (17.09.0~ce-0~debian) ...
Setting up docker-ce (17.06.2~ce-0~debian) ...
Processing triggers for systemd (232-25+deb9u1) ...
Processing triggers for man-db (2.7.6.1-2) ...