Installing Precise from debootstrap, then kubuntu-desktop with 
APT::Install-Recommends "false"; then lightdm, lightdm-kde-greeter, xorg, 
linux-image-generic causes the similar problem with lightdm.
[+0.21s] DEBUG: Failed to load session file 
/usr/share/xgreeters/default.desktop: No such file or directory
In /usr/share/xgreeters I have lightdm-kde-greeter.desktop but the file 
/etc/lightdm/lightdm.conf does not exist! I will have to create it manually and 
to write there something like:
"[SeatDefaults]
greeter-session=lightdm-gtk-greeter"
I think it should solve the problem.
It is interesting that there is no package owns the /etc/lightdm/lightdm.conf 
file (if is has been generated automatically). Why is it created when 
recommends installation is switched on and has not been created automatically 
during the installation without recommends? What is responsible for generating 
the /etc/lightdm/lightdm.conf file?

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Touch seeded packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/842194

Title:
  greeter doesn't start "failed to load session file"

Status in lightdm package in Ubuntu:
  Triaged

Bug description:
  As of today, lightdm on oneiric doesn't show a login screen.  I have
  verified the greeters are installed so this is different to bug
  816646.  The most likely lines in the log seem to be

    Failed to load session file /usr/share/xgreeters/.desktop: No such file or 
directory
    Failed to start greeter 
    Stopping display

  I'm just left at a text screen with various stair-stepped log
  messages.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: lightdm 0.9.3-0ubuntu8
  ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
  Uname: Linux 3.0.0-10-generic x86_64
  Architecture: amd64
  Date: Tue Sep  6 08:32:54 2011
  EcryptfsInUse: Yes
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_AU.UTF-8
   SHELL=/bin/zsh
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to oneiric on 2011-08-23 (12 days ago)

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