If docker was hung, or its postinst was stuck, maybe it's this bug:
https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1628053
** Changed in: docker.io (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1769295
Title:
package docker.io 17.12.1-0ubuntu1 failed to install/upgrade:
installed docker.io package post-installation script subprocess was
killed by signal (Killed)
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