pure-ftpd-wrapper: command not found

Have You tried accessing the binary with the full path?

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/pure-ftpd-wrapper - from package: pure-ftpd-common

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