tcbd: 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/tcbd - from package: tcm

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