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https://bugs.launchpad.net/bugs/1594229

Title:
  Not able to use multiple USC instances

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.18 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Xenial:
  Fix Released
Status in lightdm source package in Yakkety:
  Fix Released

Bug description:
  [Impact]
  If more than one Mir session is running in an xlocal seat LightDM will 
attempt to launch one Unity System Compositor per session. This used to work 
but now USC only allows a single instance.

  [Test Case]
  1. Start LightDM
  2. Log into a Mir session
  3. Switch to the greeter
  3. Log into another Mir session (with a second user)

  Expected result:
  Second session shows.

  Observed result:
  Can't log in because USC won't start a second time.

  [Regression Potential]
  Some refactoring was required to make this work, which could cause a 
regression. Existing regression tests reduce this risk.

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