Trusty doesn't have systemd, but upstart. There the steps were:
- disable updates and security in /etc/apt/sources.list
- install mysql-server-5.5
- use mysql command line to connect and create a test database
- stop mysql: stop mysql
- disable mysql: echo manual | sudo tee /etc/init/mysql.override
- reboot to confirm mysql won't start automatically (yes)
- re-enable updates and security in sources.list
- apt dist-upgrade
It worked just fine.
For now, this bug is confirmed in xenial only.
** Package changed: mysql-5.5 (Ubuntu) => mysql-5.7 (Ubuntu)
** Also affects: mysql-5.7 (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: mysql-5.7 (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1745185
Title:
If apt-get upgrade is run on mysql server when the server is disabled,
the upgrade fails.
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