timblclient: 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/timblclient - from package: timblserver

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

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