gm-zip+sign_backups: 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/sbin/gm-zip+sign_backups - from package: gnumed-server

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

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