I just loaded a CD-RW disc and received this message. I also loaded a DVD-R and got the same type of message. Both disc have data on it. But it seems I can view & access the info on them without issues. Just thought I would let you know!
Error mounting /dev/sr0 at /run/media/saptech/VOID_LIVE: Command-line `mount -t “iso9660” -o “uhelper=udisks2,nodev,nosuid,uid=1000,gid=100,iocharset=utf8,mode=0400,dmode=0500” “/dev/sr0” “/run/media/saptech/VOID_LIVE”’ exited with non-zero exit status 32: mount: unknown filesystem type ‘iso9660’