opal-checkpoint: 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/opal-checkpoint - from package: openmpi-checkpoint

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

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