It behaves differently (the installation succeeds) if you install mysql- server from a bash prompt inside the container. Running the installation as a parameter to `systemd-nspawn` will fail. I have tested this on a 16.04.3 system and an 18.04 system.
I just noticed something especially weird: if I add `dpkg --configure -a` to the end of the `systemd-nspawn` command, then the `apt install` command will reliably finish. Prepare a base container to be used for the tests: 1. debootstrap bionic bionic 2. rm bionic/etc/resolv.conf This will always fail: sudo rm -rf testmysql && sudo cp -a bionic testmysql && sudo systemd-nspawn -D testmysql bash -c 'apt update && apt install mysql-server' This will always succeed: sudo rm -rf testmysql && sudo cp -a bionic testmysql && sudo systemd-nspawn -D testmysql bash -c 'apt update && apt install mysql-server; dpkg --configure -a' -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1752705 Title: When run from systemd-nspawn, installation of mysql-server fails because postinst fails to shut down server Status in mysql-5.7 package in Ubuntu: New Status in systemd package in Ubuntu: New Bug description: Creating a fresh Bionic directory with `debootstrap` and then attempting to install `mysql-server` inside a `systemd-nspawn` container fails with the following message: Setting up mysql-server-5.7 (5.7.21-1ubuntu1) ... invoke-rc.d: could not determine current runlevel * Stopping MySQL database server mysqld [ OK ] update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode Renaming removed key_buffer and myisam-recover options (if present) Error: Unable to shut down server with process id 532 dpkg: error processing package mysql-server-5.7 (--configure): installed mysql-server-5.7 package post-installation script subprocess returned error exit status 1 Steps to reproduce: 1. debootstrap bionic testmysql 2. rm testmysql/etc/resolv.conf 2. systemd-nspawn -D testmyql --bind /etc/resolv.conf /bin/bash -c 'apt update && apt install mysql-server' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mysql-5.7/+bug/1752705/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
