phnxdeco: 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/phnxdeco - from package: phnxdeco

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