lxde-logout: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/lxde-logout - from package: lxde-common

You may install the required package with command apt-get install {package}

Error in other languages:
lxde-logout: bevel nie gevind nie
lxde-logout: comandă negăsită
lxde-logout: comando não encontrado
lxde-logout: commande introuvable
lxde-logout: command not found
lxde-logout: käsku ei ole
lxde-logout: không tìm thấy lệnh
lxde-logout: komanda nerasta
lxde-logout: Kommando nicht gefunden.
lxde-logout: kommandot finns inte
lxde-logout: komut yok
lxde-logout: nie znaleziono polecenia
lxde-logout: níor aimsíodh an t-ordú
lxde-logout: no se encontró la orden
lxde-logout: no s'ha trobat l'ordre
lxde-logout: opdracht niet gevonden
lxde-logout: parancs nem található
lxde-logout: perintah tidak ditemukan
lxde-logout: príkaz nenájdený
lxde-logout: příkaz nenalezen
lxde-logout: команда не найдена
lxde-logout: командата не е открита
lxde-logout: 命令找不到
lxde-logout: コマンドが見つかりません