no choice session.desktop in lightdm

[VIRZI]

I can not select multiple session.desktop in lightdm with the directional keys on the keyboard or mouse

(I sudo update-manager-d and several session.desktop settled due to poor control of my share of the complication with cairo-dock Defaulted and automatic login)

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: lightdm 1.8.4-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic i686
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
Date: Sun Dec 29 14:29:44 2013
InstallationDate: Installed on 2013-08-17 (133 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: Upgraded to saucy on 2013-12-28 (0 days ago)