Hello Brian You are right.
According to /etc/fstab, /dev/sdb1 has a mount point /media/usb0 However I had to mount it first: sudo mount /dev/sdb1 /media/usb0 and then followed by the command: sudo apt-cdrom -d /media/usb0 add And the error message is always the same, viz: Using CD-ROM mount point /media/cdrom/ Identifying.......{a long string of alphanumeric characters} Scanning disc for index files............... Found 0 package indexes, 0 source indexes, 0 translation indexes and 0 signatures W: Failed to mount '/dev/sr0' to '/media/cdrom/' E: Unable to locate any package files, perhaps this is not a Debian disc or the wrong architecture -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140422194646.244...@gmx.com