nuweb2noweb: 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/nuweb2noweb - from package: noweb

You may install the required package with command apt-get install {package}
Error in other languages:
nuweb2noweb: bevel nie gevind nie
nuweb2noweb: comandă negăsită
nuweb2noweb: comando não encontrado
nuweb2noweb: commande introuvable
nuweb2noweb: command not found
nuweb2noweb: käsku ei ole
nuweb2noweb: không tìm thấy lệnh
nuweb2noweb: komanda nerasta
nuweb2noweb: Kommando nicht gefunden.
nuweb2noweb: kommandot finns inte
nuweb2noweb: komut yok
nuweb2noweb: nie znaleziono polecenia
nuweb2noweb: níor aimsíodh an t-ordú
nuweb2noweb: no se encontró la orden
nuweb2noweb: no s'ha trobat l'ordre
nuweb2noweb: opdracht niet gevonden
nuweb2noweb: parancs nem található
nuweb2noweb: perintah tidak ditemukan
nuweb2noweb: príkaz nenájdený
nuweb2noweb: příkaz nenalezen
nuweb2noweb: команда не найдена
nuweb2noweb: командата не е открита
nuweb2noweb: 命令找不到
nuweb2noweb: コマンドが見つかりません