timbl: 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/timbl - from package: timbl

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

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