update error message when running on a bootc/ostree system

dnf/cli/cli.py

@@ -215,12 +215,11 @@ def do_transaction(self, display=()):
                 logger.info(_("{prog} will only download packages, install gpg keys, and check the "
                               "transaction.").format(prog=dnf.util.MAIN_PROG_UPPER))
             if dnf.util.is_bootc_host():
-                _container_msg = _("""
-*** This system is managed with ostree.  Changes to the system
-*** made with dnf will be lost with the next ostree-based update.
-*** If you do not want to lose these changes, use 'rpm-ostree'.
+                _bootc_host_msg = _("""
+*** error: system is configured to be read-only; for more
+*** information run `bootc status` or `ostree admin status`.
 """)
-                logger.info(_container_msg)
+                logger.info(_bootc_host_msg)
                 raise CliError(_("Operation aborted."))
 
             if self._promptWanted():