notangle: 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/notangle - from package: noweb

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

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