If the scanner can be found only by the superuser that might indicate that an udev rule that allows scanner access for ordinary users is missing. Or that this udev rule gives scanner access to an user group you happen not to be part of...
If the scanner can be found only by the superuser that might indicate that an udev rule that allows scanner access for ordinary users is missing. Or that this udev rule gives scanner access to an user group you happen not to be part of...