@
dm800se:~# ls -l /dev/ttyUSB*
crwxrwxrwx 1 root dialout 188, 0 Aug 2 21:51 /dev/ttyUSB0
crwxrwxrwx 1 root dialout 188, 1 Aug 2 21:38 /dev/ttyUSB1
crwxrwxrwx 1 root dialout 188, 2 Aug 2 21:51 /dev/ttyUSB2
crwxrwxrwx 1 root dialout 188, 3 Aug 2 21:51 /dev/ttyUSB3
root@
dm800se:~# udevadm info -n /dev/ttyUSB0 -a
device node not found
root@
dm800se:~# udevadm info -n /dev/ttyUSB1 -a
device node not found
root@
dm800se:~# udevadm info -n /dev/ttyUSB2 -a
device node not found
root@
dm800se:~# udevadm info -n /dev/ttyUSB3 -a
device node not found