minissdpd: 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/minissdpd - from package: minissdpd

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

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