Looks like it was a leftover lock file. Your command returned:

Adding system user `guest-Os5HCE' (UID 197) ...
Adding new group `guest-Os5HCE' (GID 248) ...
Adding new user `guest-Os5HCE' (UID 197) with group `guest-Os5HCE' ...
useradd: existing lock file /etc/subgid.lock without a PID
useradd: cannot lock /etc/subgid; try again later.
adduser: `/usr/sbin/useradd -d / -g guest-Os5HCE -s /bin/bash -u 197 
guest-Os5HCE' returned error code 18. Exiting.
umount: /tmp/guest-Os5HCE: not mounted

I have removed /etc/subgid.lock and now all works as expected. How can
this lock file be left over? Perhaps leftover locks should be deleted at
boot time.

Thanks, Robert, you've solved my problem!

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1304505

Title:
  Guest session not working

Status in “lightdm” package in Ubuntu:
  Incomplete

Bug description:
  After the last update, I cannot log into the guest session from
  lightdm. Session, does not start up, and I get thrown back to the
  login screen.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: lightdm 1.8.5-0ubuntu1
  ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
  Uname: Linux 3.11.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  Date: Tue Apr  8 17:51:14 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-12-20 (473 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  LightdmConfig:
   [SeatDefaults]
   user-session=ubuntu
   greeter-session=unity-greeter
   autologin-user=stereo
  MarkForUpload: True
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to saucy on 2013-10-18 (172 days ago)

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