Refer: https://askubuntu.com/questions/453482/update-to-14-04-unity-is-not-loading-after-i-login-to-the-admin-profile-after
Switch to terminal (CTRL+ALT+F1) then removing the configuration file ~/.config/dconf/user like this :
Note: You may want to back them up before deleting them; however, this is a binary file, so you cannot edit it manually.
$ sudo service lightdm stop
$ rm ~/.config/dconf/user
$ sudo service lightdm start
You can use the following to backup and restore the configurations in the future, and even put them into a repository such as git.
$ mkdir -p ~/Documents/Backups/config/dconf/user.d
$ dconf dump / > ~/Documents/Backups/config/dconf/user.d/complete.conf
$ cat ~/Documents/Backups/config/dconf/user.d/* | dconf load /
Refer: https://askubuntu.com/questions/72070/how-do-i-change-dconf-keys-without-a-gui-for-a-post-install-script
gsettings set com.canonical.indicator.session show-real-name-on-panel false
No, it will not be deprecated. dconf replaced gconf which will be deprecated. gconf can be changed with gconf-editor or gconftool-2. dconf can be changed with dconf-editor or gsettings.
Quick Tutorial to backup and restore the settings:
http://catern.com/2014/12/21/plain-text-configuration-gnome.html
dconf dump / > ~/.config/dconf/user.d/everything.conf
cat ~/.config/dconf/user.d/* | dconf load /