/dev/sr0安装时出错/media/james/Ubuntu 14.04 LTS i386：命令行
mount -t "iso9660" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500" "/dev/sr0" "/media/james/Ubuntu 14.04 LTS i386"' exited with non-zero exit status 32: mount: block device /dev/sr0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
`dmesg | tail or so`
我怎样才能解决这个问题？