Thanks for filing this bug in Ubuntu.
There are some interesting warnings in the logs you provided:
WARN: uid is 0 but '/' is owned by 1004
WARN: / is group writable!
and
Setting up openssh-server (1:7.2p2-4ubuntu2.6) ...
Unsafe symlinks encountered in /var/run/sshd, refusing.
More details should be present in /var/log/syslog, /var/log/auth.log
and/or in the output of journalctl -xe.
Could you please inspect those and report back, or attach them to this
bug?
** Changed in: openssh (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1814586
Title:
package openssh-server 1:7.2p2-4ubuntu2.6 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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