This is a known issue that was mentioned in the release notes:
This is an early set of images, so you can expect some bugs. Among
these are the following (so you do not need to bother reporting these
if you encounter them):
* The desktop CD fails to reboot when the graphical installer
finishes, due to a change in GDM which is not yet picked up by
other components of the distribution.
** Changed in: Ubuntu
Status: Unconfirmed => Rejected
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LiveCD Install Reboot Not Activating
https://launchpad.net/bugs/87922
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