desproxy-inetd: 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/bin/desproxy-inetd - from package: desproxy

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