lt-expand: 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/lt-expand - from package: lttoolbox

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

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