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Dist-upgrade from Ubuntu 14 to 16 fails: Sub-process /usr/bin/dpkg returned an error code (1)

Dist-upgrade from Ubuntu 14.04 to Ubuntu 16.04.1 fails to update MySQL 5.5:

Errors were encountered while processing: 
mysql-server-5.7 
mysql-server 
E: Sub-process /usr/bin/dpkg returned an error code (1)

Plesk bug with ID #PPPM-7431 fixed in Plesk Obsidian on February 12, 2019 (fixed as PPP-33523, Linux).

For Plesk Obsidian, install the latest Plesk micro-updates.

For Plesk Onyx, upgrade to the latest Plesk version.

If update is not possible for some reason, try the following

1. Login to Plesk server over SSH

2. Open /etc/mysql/my.cnf and comment out two parameters:

[mysqld_safe] 
#innodb_additional_mem_pool_size=500K 
[mysqld] 
#innodb_additional_mem_pool_size=500K

3. Restart MySQL service:

# service mysql restart

4. Complete the failed upgrade:

# apt-get -f install

# /opt/psa/bin/distupgrade.helper.ubt14-ubt16.x64.sh

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