vigor: 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/vigor - from package: vigor

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