make-fai-nfsroot: 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/sbin/make-fai-nfsroot - from package: fai-server

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

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