It also succeeds if I replace `dpkg --configure -a` with `ls`:
rm -rf testmysql && cp -a bionic testmysql && systemd-nspawn -D testmysql bash 
-c 'apt update && apt install mysql-server; ls'

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  When run from systemd-nspawn, installation of mysql-server fails
  because postinst fails to shut down server

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