pysnmpset: 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/pysnmpset - from package: python-pysnmp4-apps

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