lt-tmxproc: 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-tmxproc - from package: lttoolbox

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

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