snap: 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/snap - from package: snap

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

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