Comment 1 for bug 1573952

Similar situation on a Ubuntu Headless Server on AWS
upgraded from 15.05 to 16.04 and after the install interruptedI now have:

Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial

however when I long in I get

New release '16.04 LTS' available.
Run 'do-release-upgrade' to upgrade to it.

running

~$ do-release-upgrade
Checking for a new Ubuntu release
No new release found

#sudo apt-get update && sudo apt-get dist-upgrade
Hit:1 http://us-east-1.ec2.archive.ubuntu.com/ubuntu wily InRelease
Get:2 http://us-east-1.ec2.archive.ubuntu.com/ubuntu wily-updates InRelease [65.9 kB]
Get:3 http://security.ubuntu.com/ubuntu wily-security InRelease [65.9 kB]
Fetched 132 kB in 0s (327 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

fired up a back up aws instance and did a release upgrade to 15.0
did another release upgrade to 16.4
upgrade failed at the same place.

killed the hung process as described above and the upgrade continued until.

Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
Error in function:

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Errors were encountered while processing:
 mysql-server-5.7
 mysql-server

Upgrade complete

The upgrade has completed but there were errors during the upgrade
process.