cannot create usergroup [SOLVED]

[52ROSt]

LM 17.3 KDE updated
virtualbox-5.1_5.1.14-112924~Ubuntu~trusty_amd64.deb direct download from VB homepage

- Installed VB by double clicking the dep-file
- Got a long list of lines in the virtualbox terminal window; last 5 messages:
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'
Unknown media type in type 'uri/mms'
Unknown media type in type 'uri/mmst'
Done
- Closed the virtualbox terminal


Opened normal terminal to see if I am registered in the user group

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rost@rost-X240:~ > id
uid=1000(rost) gid=1000(rost) groups=1000(rost),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),108(lpadmin),111(sambashare)

Followed the advice in the VB manual for Version 5.1.14 and did:

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rost@rost-X240:~ > sudo usermod -a -G vboxusers rost
[sudo] password for rost: 
rost@rost-X240:~ > id
uid=1000(rost) gid=1000(rost) groups=1000(rost),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),108(lpadmin),111(sambashare)

Still there is no VB usergroup of which I am a member.

What did I make wrong?
How can I create a VB usergroup and make me member of it?

Thanks in advance for your advice!

[Martin]

Changes to group membership in Linux only get active at login, so you need to logout and login again (or reboot).

[52ROSt]

Thank you very much for this information!!!

I just checked it and the vbox usergroup is there.