I think there was an issue on my end. Most likely I think it was the 
fact that the upgrade process from 15.10 to 16.04LTS was interrupted by 
my 5 year old daughter who snuck in to the room and pressed some keys on 
the keyboard. The last error I saw on the upgrade was something like 
"Adding system-journal group...group already exists....exiting."

I waited a while before touching the system, as I wasn't sure if the 
install was still trying to do something in the background and I didn't 
want to make things worse. A few reboots, and some "sudo apt-get -f 
install" and "sudo apt-get dist-upgrade", and I was able to get through 
the upgrade process, aside from the mySQL issue.

I was able to resolve that by killing the mysqld process and then 
running system updates, which then completed the mySQL install with no 
errors.

L

On 04/25/2016 11:54 AM, Robie Basak wrote:
> Thank you for taking the time to report this bug and helping to make
> Ubuntu better.
>
> It seems that the old mysqld failed to stop, so mysql_upgrade is talking
> to the old server instead of the new one. We didn't encounter this in
> testing, so we think it could be an issue on your system, but we don't
> have enough information in this report to determine that.
>
> Can you see if you can determine why mysqld fails to stop on your
> system? Once you get it properly stopped, I think "sudo apt-get -f
> install" should succeed.
>
> I'll mark this bug as Incomplete for now, as it isn't clear that this is
> a bug as opposed to some kind of misconfiguration on your system. If you
> can figure out how to get an Ubuntu system into this state in a way that
> is clearly a bug ("steps to reproduce"), please provide that and change
> the bug status back to New.
>
> ** Changed in: mysql-5.7 (Ubuntu)
>         Status: Confirmed => Incomplete
>

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https://bugs.launchpad.net/bugs/1574660

Title:
  package mysql-server-5.7 5.7.12-0ubuntu1 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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