g15composer: 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/g15composer - from package: g15composer

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

Error in other languages:
g15composer: bevel nie gevind nie
g15composer: comandă negăsită
g15composer: comando não encontrado
g15composer: commande introuvable
g15composer: command not found
g15composer: käsku ei ole
g15composer: không tìm thấy lệnh
g15composer: komanda nerasta
g15composer: Kommando nicht gefunden.
g15composer: kommandot finns inte
g15composer: komut yok
g15composer: nie znaleziono polecenia
g15composer: níor aimsíodh an t-ordú
g15composer: no se encontró la orden
g15composer: no s'ha trobat l'ordre
g15composer: opdracht niet gevonden
g15composer: parancs nem található
g15composer: perintah tidak ditemukan
g15composer: príkaz nenájdený
g15composer: příkaz nenalezen
g15composer: команда не найдена
g15composer: командата не е открита
g15composer: 命令找不到
g15composer: コマンドが見つかりません