lxsession-db: 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/lxsession-db - from package: lxsession

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

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