lubuntu@lubuntu:~$ export BROWSER='sudo -H -u lubuntu firefox'; sudo -E calamares -D6
QStandardPaths: runtime directory '/run/user/999' is not owned by UID 0, but a directory permissions 0700 owned by UID 999 GID 999
kf.dbusaddons: DBus session bus not found. To circumvent this problem try the following command (with bash):
    export $(dbus-launch)