ompi-restart: 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/ompi-restart - from package: openmpi-checkpoint

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