update-ifupdown-scripts-zg2.d-symlinks: 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/update-ifupdown-scripts-zg2.d-symlinks - from package: ifupdown-scripts-zg2

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

Error in other languages:
update-ifupdown-scripts-zg2.d-symlinks: bevel nie gevind nie
update-ifupdown-scripts-zg2.d-symlinks: comandă negăsită
update-ifupdown-scripts-zg2.d-symlinks: comando não encontrado
update-ifupdown-scripts-zg2.d-symlinks: commande introuvable
update-ifupdown-scripts-zg2.d-symlinks: command not found
update-ifupdown-scripts-zg2.d-symlinks: käsku ei ole
update-ifupdown-scripts-zg2.d-symlinks: không tìm thấy lệnh
update-ifupdown-scripts-zg2.d-symlinks: komanda nerasta
update-ifupdown-scripts-zg2.d-symlinks: Kommando nicht gefunden.
update-ifupdown-scripts-zg2.d-symlinks: kommandot finns inte
update-ifupdown-scripts-zg2.d-symlinks: komut yok
update-ifupdown-scripts-zg2.d-symlinks: nie znaleziono polecenia
update-ifupdown-scripts-zg2.d-symlinks: níor aimsíodh an t-ordú
update-ifupdown-scripts-zg2.d-symlinks: no se encontró la orden
update-ifupdown-scripts-zg2.d-symlinks: no s'ha trobat l'ordre
update-ifupdown-scripts-zg2.d-symlinks: opdracht niet gevonden
update-ifupdown-scripts-zg2.d-symlinks: parancs nem található
update-ifupdown-scripts-zg2.d-symlinks: perintah tidak ditemukan
update-ifupdown-scripts-zg2.d-symlinks: príkaz nenájdený
update-ifupdown-scripts-zg2.d-symlinks: příkaz nenalezen
update-ifupdown-scripts-zg2.d-symlinks: команда не найдена
update-ifupdown-scripts-zg2.d-symlinks: командата не е открита
update-ifupdown-scripts-zg2.d-symlinks: 命令找不到
update-ifupdown-scripts-zg2.d-symlinks: コマンドが見つかりません