pgfouine_vacuum: 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/pgfouine_vacuum - from package: pgfouine

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

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