gsutil: 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/bin/gsutil - from package: gsutil

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