To enable this in LightDM, set X-LightDM-DesktopName in /usr/share/xsessions/*.desktop. i.e. for Unity:
/usr/share/xsessions/ubuntu.desktop: [Desktop Entry] Name=Ubuntu Comment=This session logs you into Ubuntu Exec=gnome-session --session=ubuntu TryExec=unity Icon= Type=Application X-LightDM-DesktopName=Unity X-Ubuntu-Gettext-Domain=gnome-session-3.0
The registered desktop names are in http://standards.freedesktop.org/menu-spec/latest/apb.html
To enable this in LightDM, set X-LightDM- DesktopName in /usr/share/ xsessions/ *.desktop. i.e. for Unity:
/usr/share/ xsessions/ ubuntu. desktop: DesktopName= Unity Gettext- Domain= gnome-session- 3.0
[Desktop Entry]
Name=Ubuntu
Comment=This session logs you into Ubuntu
Exec=gnome-session --session=ubuntu
TryExec=unity
Icon=
Type=Application
X-LightDM-
X-Ubuntu-
The registered desktop names are in http:// standards. freedesktop. org/menu- spec/latest/ apb.html