fm: 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/fm - from package: fmtools

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

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