To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
ubuntu@ubuntu:~$ lsusb -t
2-1.1:1.2: No such file or directory
1-1.1.3:1.0: No such file or directory
1-1.1.3:1.1: No such file or directory
1-1.1.3:1.2: No such file or directory
1-1.1.3:1.3: No such file or directory
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/8p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/3p, 480M
|__ Port 1: Dev 3, If 0, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M
|__ Port 1: Dev 3, If 1, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M
|__ Port 1: Dev 3, If 2, Class=vend., Driver=, 480M
|__ Port 2: Dev 4, If 0, Class=HID, Driver=usbhid, 1.5M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 1: Dev 3, If 0, Class=hub, Driver=hub/3p, 12M
|__ Port 1: Dev 7, If 0, Class=HID, Driver=usbhid, 12M
|__ Port 2: Dev 8, If 0, Class=HID, Driver=usbhid, 12M
|__ Port 3: Dev 9, If 0, Class=vend., Driver=, 12M
|__ Port 3: Dev 9, If 1, Class='bInterfaceClass 0xe0 not yet handled', Driver=, 12M
|__ Port 3: Dev 9, If 2, Class=vend., Driver=, 12M
|__ Port 3: Dev 9, If 3, Class=app., Driver=, 12M
|__ Port 2: Dev 4, If 0, Class=HID, Driver=usbhid, 12M
|__ Port 2: Dev 4, If 1, Class=HID, Driver=usbhid, 12M
|__ Port 2: Dev 4, If 2, Class=HID, Driver=bcm5974, 12M
|__ Port 3: Dev 5, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 4: Dev 6, If 0, Class=stor., Driver=usb-storage, 480M
ubuntu@ubuntu:~$