From log:
Setting up bind9 (1:9.7.3.dfsg-1ubuntu2.4) ...
* Stopping domain name service... bind9 [80G resolvconf: Error:
/etc/resolv.conf must be a symlink
invoke-rc.d: initscript bind9, action restart failed.
dpkg: error processing bind9 (--configure):
subprocess installed
Thank you for taking the time to report this bug and helping to make
Ubuntu better.
This looks like a local configuration problem, rather than a bug in
Ubuntu, so I'm marking this bug as Invalid.
Specifically, you seem to have a modified resolv.conf which is causing
the bind9 postinst to fail,
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https://bugs.launchpad.net/bugs/1021559
Title:
bind9 upgrade failed.
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