usermod is shell command for manipulating user accounts in Ubuntu and almost any other Linux distro. You can use it to add existing user to existing group, for example once installed Virtualbox (sudo apt-get install virtualbox-ose) you should add your user account to vboxusers group to be able to use USB flash drives inside virtual machines.
To add user bob to supplementary group vboxusers use usermod command as follows (-a parameter specifies adding while -G points to group name):
sudo usermod -a -G vboxusers bob
Want to change user’s primary group from default to something else (e.g. group named adm)? No problems:
sudo usermod -g adm bob



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