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'
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'