gm-convert_file: 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/gm-convert_file - from package: gnumed-client

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

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