afclient: 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/afclient - from package: apf-client

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

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