mozplugger-controller: 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/mozplugger-controller - from package: mozplugger

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

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