pvm: 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/pvm - from package: pvm

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

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