Fedora制作的一个Livecd运行出现如下错误该怎么解决   用Fedora17制作了一个Livecd 的iso文件，用虚拟机启动后出现下面情况，该如何解决   www.2cto.com   [ok] started show plymouth boot screen   [ok] Reached target Basic System  dracut-initqueue[180]:mount: unknown filesystem type iso9660  dracut-initqueue[180]:Warning  dracut-initqueue[180]:Warining: dracut FATAL:Failed to mount block device of live image  dracut-initqueue[180]:Warning: dracut: Refusing to continue  dracut-initqueue[180]:Warning: /dev/mapper/live-rw does not exist  Generating "/run/initramfs/sosreport.txt"    Entering emergency mode.Exit the shell to continue  Type "journalctl" to view system logs  you might want to save "/run/initramfs/sosreport.txt" to aUSB stick or /boot  after mounting them and attach it to a bug report    dracut:/#_