subunit-notify: 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

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 CentOS possible default full paths are:

/usr/bin/subunit-notify - from package: python-subunit

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/subunit-notify - from package: subunit

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