We did change how mysql-server-5.7.postinst handles internal server
start and stop in Bionic in order to fix bug 1592669.
** Summary changed:
- installation of mysql-server fails because postinst fails to shut down server
+ When run from systemd-nspawn, installation of mysql-server fails because
ubuntu@b-test:~$ sudo systemd-nspawn -D testmysql --bind /etc/resolv.conf
/bin/bash
Spawning container testmysql on /home/ubuntu/testmysql.
Press ^] three times within 1s to kill container.
Host and machine ids are equal (92544cb0ba5946158c7c4f9b57691fe3): refusing to
link journals
bash: cannot
my nspawn failed to reproduce this (probably too old on xenial), but
doing the same in a chroot instead of systemd-nspawn works fine.
Setting up mysql-server-5.7 (5.7.21-1ubuntu1) ...
invoke-rc.d: could not determine current runlevel
* Stopping MySQL database server mysqld
