I have six boys, and they tend to ask another parent when wanting to use one of the computers, but don't bother asking the logged in user if they're finished. All four machines are running Ubuntu 12.04 with gnome 3.
How can I permanently disable user switching - not just in the user menu, but also on the lock screen?
This is for Gnome 3 (aka gnome-shell, NOT Unity), and will disable both the "Switch User" option in the user menu as well as on the lock screen:
Start the terminal with Ctrl-Alt-T, and then type:
sudo apt-get install dconf-toolsdconf-editorapps->indicator-session->user-show-menu:
Enable org->gnome->desktop->lockdown->disable-user-switching:
Close dconf-editor, logout and log in to see the changes.
Another way to do this would be using the 'dconf editor'.
You can install it from software center.
After opening it click on 'apps' -> 'indicator session' and uncheck 'user-show-menu'.
Close the program and log out and back in.
How many user do you have? By default its only your acc and Guest acc. To disable Guest acc follow this guide.
Open /etc/lightdm/lightdm.conf file from your terminal using the following command
gksudo gedit /etc/lightdm/lightdm.conf
Add the following line
allow-guest=false
Save and exit the file
Finally you have to restart lightdm using the following command from your terminal
sudo restart lightdm
You can disable user-switching by following command in terminal:
gsettings set org.gnome.desktop.lockdown disable-lock-screen true
