On Ubuntu, I'm trying to mount my USB
 dmesg ... USB Mass Storage support registered. ... scsi 2:0:0:0 Direct-Access Kingston DataTraveler 2.0 ... sd 2:0:0:0 [sdb] 15679488 512-byte logical blocks: (8.02 GB/7.47 GiB) ... sd 2:0:0:0 Write Protect is off (so I assume that /dev/sdb is my USB pendrive)  mkdir /mnt/usb  mount /dev/sdb /mnt/usb mount: mounting /dev/sdb on /mnt/usb failed: Invalid Argument
I also tried with "-t ext4" with no success. What am I doing wrong? Thank you very much.