compose: 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/compose - from package: mime-support

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

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