nountangle: 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/nountangle - from package: noweb

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

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