pvmgroups: 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/pvmgroups - from package: pvm-dev

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

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