FAISERVER: 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/share/debian-lan-config/fai/config/files/usr/local/sbin/debian-lan-chroots/FAISERVER - from package: debian-lan-config

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

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