ttlayout: 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/ttlayout - from package: ctn

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

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