Enable root Account Login for Ubuntu 15.04/Ubuntu 15.10
The lightdm logon option of Ubuntu 15.04/Ubuntu 15.10 does not have any other user options, which directly leads to failure to log on as a root user. It may be difficult for an individual to have root user permissions. Here I will introduce how to enable root Account Logon in Ubuntu 15.04/Ubuntu 15.10.
1. Open the terminal
2. Enter sudo vi/usr/share/lightdm. conf. d/50-ubuntu.conf.
Or enter sudo vim/usr/share/lightdm. conf. d/50-ubuntu.conf (vim needs to be installed)
Or enter sudo gedit/usr/share/lightdm. conf. d/50-ubuntu.conf.
3. In the pop-up edit box, enter greeter-show-manual-login = true to save and close.
4. Set the password for the root user, and enter sudo passwd root in the middle end.
5. Shut down and restart. Enter the root account and password in the extra logon box!
6. The settings are complete.