symphony: 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/symphony - from package: coinor-symphony

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

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