gl-gen-grub2-efi-bldr: command not found

Have You tried accessing the binary with the full path?

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/share/drbl/setup/files/gparted/usr/bin/gl-gen-grub2-efi-bldr - from package: clonezilla

You may install the required package with command apt-get install {package}
Error in other languages:
gl-gen-grub2-efi-bldr: bevel nie gevind nie
gl-gen-grub2-efi-bldr: comandă negăsită
gl-gen-grub2-efi-bldr: comando não encontrado
gl-gen-grub2-efi-bldr: commande introuvable
gl-gen-grub2-efi-bldr: command not found
gl-gen-grub2-efi-bldr: käsku ei ole
gl-gen-grub2-efi-bldr: không tìm thấy lệnh
gl-gen-grub2-efi-bldr: komanda nerasta
gl-gen-grub2-efi-bldr: Kommando nicht gefunden.
gl-gen-grub2-efi-bldr: kommandot finns inte
gl-gen-grub2-efi-bldr: komut yok
gl-gen-grub2-efi-bldr: nie znaleziono polecenia
gl-gen-grub2-efi-bldr: níor aimsíodh an t-ordú
gl-gen-grub2-efi-bldr: no se encontró la orden
gl-gen-grub2-efi-bldr: no s'ha trobat l'ordre
gl-gen-grub2-efi-bldr: opdracht niet gevonden
gl-gen-grub2-efi-bldr: parancs nem található
gl-gen-grub2-efi-bldr: perintah tidak ditemukan
gl-gen-grub2-efi-bldr: príkaz nenájdený
gl-gen-grub2-efi-bldr: příkaz nenalezen
gl-gen-grub2-efi-bldr: команда не найдена
gl-gen-grub2-efi-bldr: командата не е открита
gl-gen-grub2-efi-bldr: 命令找不到
gl-gen-grub2-efi-bldr: コマンドが見つかりません