虚拟机安装一键安装ROS，无法替换源

[之欧]

apt更新失败,后续程序可能会继续尝试...,['\n', 'WARNING: apt does not have a stable CLI interface. Use with caution in scripts.\n', '\n', '\n', "(appstreamcli:2734): GLib-CRITICAL **: 10:42:14.307: g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types || GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite (GVSB(builder)->type)' failed\n", '\n', "(appstreamcli:2734): GLib-CRITICAL **: 10:42:14.307: g_variant_new_variant: assertion 'value != NULL' failed\n", '\n', '(appstreamcli:2734): GLib-ERROR **: 10:42:14.307: g_variant_new_parsed: 11-13:invalid GVariant format string\n', 'Trace/breakpoint trap (core dumped)\n', 'W: GPG 错误：https://packages.ros.org/ros/ubuntu bionic InRelease: 由于没有公钥，无法验证下列签名： NO_PUBKEY F42ED6FBAB17C654\n', 'E: 仓库 “https://packages.ros.org/ros/ubuntu bionic InRelease” 没有数字签名。\n', 'W: GPG 错误：https://packages.ros.org/ros2/ubuntu bionic InRelease: 由于没有公钥，无法验证下列签名： NO_PUBKEY F42ED6FBAB17C654\n', 'E: 仓库 “https://packages.ros.org/ros2/ubuntu bionic InRelease” 没有数字签名。\n', "E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh-cache > /dev/null; fi'\n", 'E: Sub-process returned an error code\n']