hey all firstly when i go to add my self to the real time group with these commands  



groupadd realtime
usermod -a -G realtime sound-warrior  

i get these errors from terminal 



sound-warrior@the-megga-machine:~$ 
sound-warrior@the-megga-machine:~$ groupadd realtime
groupadd: cannot lock /etc/group; try again later.
sound-warrior@the-megga-machine:~$ usermod -a -G realtime sound-warrior 
usermod: group 'realtime' does not exist
sound-warrior@the-megga-machine:~$ 
 

does any one know what these errors mean and how to solve the problem? 

secondly how do you set up and use memory allocation and memory locking for audio work? 

Your help with this problem and question would be most welcome. 


Kind regards trahern.