How can I invoke a user switch from the command line?

command-line unity-greeter session 12.04 switch-user

gdmflexiserver as a legacy option to provide the greeter switcher service during the transition between GDM and LightDM.

This has now been dropped from 12.04.

The replacement command is:

dm-tool switch-to-greeter

Other useful dm-tool options (dm-tool --help):

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