Try the next drive letter on failure

src/freedombone-recoverkey

@@ -202,6 +202,14 @@ function interactive_gpg_from_usb {
                     reconstruct_key
                     return 0
                 fi
+                if [[ "$GPG_USB_DRIVE" == *"sda1" ]]; then
+                    GPG_USB_DRIVE=/dev/sdb1
+                    write_config_param USB_DRIVE "$GPG_USB_DRIVE"
+                    umount -f $GPG_USB_MOUNT
+                    rm -rf $GPG_USB_MOUNT
+                    ${PROJECT_NAME}-recoverkey -u "$MY_USERNAME" -d sdb
+                    exit 0
+                else
                     dialog --title $"Encryption keys" \
                            --msgbox $"The directory $GPG_USB_MOUNT/.gnupg or $GPG_USB_MOUNT/.gnupg_fragments was not found" 6 70
                     umount -f $GPG_USB_MOUNT
@@ -209,6 +217,7 @@ function interactive_gpg_from_usb {
                     exit 723814
                 fi
             fi
+        fi
 
         if [ -d $GPG_USB_MOUNT/.gnupg ]; then
             if [ ! -d $HOME_DIR/.gnupg ]; then