Virtualbox:effective UID is not root (euid=1000 egid=100 uid=1000 gid=100)

Error running VirtualBox on desktop:
The virtual machine ' XP ' had terminated unexpectedly during startup with exit code 1 (0x1).
Effective UID is not root (euid=1000 egid=482 uid=1000 gid=482) (rc=-10)
Please try reinstalling VirtualBox.

Error prompt to run/usr/lib/virtual/virtualbox with manual knock command
Virtualbox:error-10 in supr3hardenedmain!
Virtualbox:effective UID is not root (euid=1000 egid=100 uid=1000 gid=100)
virtualbox:tip! It may help to reinstall VirtualBox.

Reinstall VirtualBox problem Still, check its mode status
Ls-l/usr/lib/virtual/virtualbox
-rwxr-x---1 root vboxusers 35368 April 01:50 VirtualBox

The above mode is wrong and needs to be modified.
sudo chmod 4711/usr/lib/virtualbox/virtualbox

Check Again
Ls-l/usr/lib/virtualbox/virtualbox
-rws--x--x 1 root vboxusers 35368 April 01:50/usr/lib/virtualbox/virtualbox
Yes, and then run, yes.

Reprinted from: http://blog.chinaunix.net/uid-20680966-id-5031178.html

Virtualbox:effective UID is not root (euid=1000 egid=100 uid=1000 gid=100)