nacctd: 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/nacctd - from package: net-acct

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

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