tlf: command not found

Have You tried accessing the binary with the full path?

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/tlf - from package: tlf

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