It seems that some or all of the package was removed manually.
Therefore the upgrade is failing
>From your logs:
chown: invalid user: ‘clamav:adm’
...
modified.conffile..etc.apparmor.d.usr.sbin.clamd: [deleted]
modified.conffile..etc.init.d.clamav.daemon: [deleted]
modified.conffile..etc.logcheck.ignore.d.paranoid.clamav.daemon: [deleted]
modified.conffile..etc.logcheck.ignore.d.server.clamav.daemon: [deleted]
Please consider purging (apt-get remove --purge) and re-installing it to
get rid of the messages.
Marking as incomplete, please feel free to reopen if after correctly
"re-populating"
** Changed in: clamav (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1559356
Title:
package clamav-freshclam 0.98.7+dfsg-0ubuntu0.14.04.1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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