VirtualBox passthrough debugging

ward@lapwm:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 008: ID 04f2:b573 Chicony Electronics Co., Ltd HD WebCam
Bus 001 Device 006: ID 04ca:3015 Lite-On Technology Corp.
Bus 001 Device 004: ID 0bda:5411 Realtek Semiconductor Corp. 4-Port USB 2.0 Hub
Bus 001 Device 009: ID 046d:0892 Logitech, Inc. OrbiCam
Bus 001 Device 007: ID 045e:07b9 Microsoft Corp. Wired Keyboard 200
Bus 001 Device 005: ID 413c:301a Dell Computer Corp. Smart Card Reader
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 036: ID 062d:0001 Taiwan Tai-Hao Enterprises Co., Ltd Smart Card Reader
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

ward@lapwm:~$ ls -lR /dev/vboxusb/
ls: cannot open directory ‘/dev/vboxusb/’: Permission denied
ward@lapwm:~$ sudo ls -lR /dev/vboxusb/
[sudo] password for ward:
/dev/vboxusb/:
total 0
drwxr-x— 2 root vboxusers 160 jul 26 18:35 001
drwxr-x— 2 root vboxusers 40 jul 22 17:06 002
/dev/vboxusb/001:
total 0
crw-rw---- 1 root vboxusers 189, 4 jul 22 15:05 005
crw-rw---- 1 root vboxusers 189, 5 jul 22 15:05 006
crw-rw---- 1 root vboxusers 189, 6 jul 22 15:05 007
crw-rw---- 1 root vboxusers 189, 7 jul 22 15:05 008
crw-rw---- 1 root vboxusers 189, 8 jul 22 15:05 009
crw-rw---- 1 root vboxusers 189, 35 jul 26 18:35 036
/dev/vboxusb/002:
total 0

ward@lapwm:~$ groups
ward adm cdrom sudo dip plugdev lpadmin sambashare
ward@lapwm:~$ getent group vboxusers
vboxusers:x:135:
ward@lapwm:~$ usermod -a -G vboxusers ward
usermod: Permission denied.
usermod: cannot lock /etc/passwd; try again later.
ward@lapwm:~$ sudo usermod -a -G vboxusers ward
ward@lapwm:~$ groups
ward adm cdrom sudo dip plugdev lpadmin sambashare
ward@lapwm:~$ groups ward
ward : ward adm cdrom sudo dip plugdev lpadmin sambashare vboxusers

ward@lapwm:~$ sudo ls -lR /dev/vboxusb/
/dev/vboxusb/:
total 0
drwxr-x— 2 root vboxusers 160 jul 26 18:35 001
drwxr-x— 2 root vboxusers 40 jul 22 17:06 002
/dev/vboxusb/001:
total 0
crw-rw---- 1 root vboxusers 189, 4 jul 22 15:05 005
crw-rw---- 1 root vboxusers 189, 5 jul 22 15:05 006
crw-rw---- 1 root vboxusers 189, 6 jul 22 15:05 007
crw-rw---- 1 root vboxusers 189, 7 jul 22 15:05 008
crw-rw---- 1 root vboxusers 189, 8 jul 22 15:05 009
crw-rw---- 1 root vboxusers 189, 35 jul 26 18:35 036
/dev/vboxusb/002:
total 0

ward@lapwm:~$ ls -lR /dev/vboxusb/
ls: cannot open directory ‘/dev/vboxusb/’: Permission denied
ward@lapwm:~$
ward@lapwm:~$
ward@lapwm:~$ which Virtualbox
ward@lapwm:~$ which virtualbox
/usr/bin/virtualbox