subunit2gtk: 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 CentOS possible default full paths are:

/usr/bin/subunit2gtk - from package: python-subunit

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

On Debian possible default full paths are:

/usr/bin/subunit2gtk - from package: subunit

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

Error in other languages:
subunit2gtk: bevel nie gevind nie
subunit2gtk: comandă negăsită
subunit2gtk: comando não encontrado
subunit2gtk: commande introuvable
subunit2gtk: command not found
subunit2gtk: käsku ei ole
subunit2gtk: không tìm thấy lệnh
subunit2gtk: komanda nerasta
subunit2gtk: Kommando nicht gefunden.
subunit2gtk: kommandot finns inte
subunit2gtk: komut yok
subunit2gtk: nie znaleziono polecenia
subunit2gtk: níor aimsíodh an t-ordú
subunit2gtk: no se encontró la orden
subunit2gtk: no s'ha trobat l'ordre
subunit2gtk: opdracht niet gevonden
subunit2gtk: parancs nem található
subunit2gtk: perintah tidak ditemukan
subunit2gtk: príkaz nenájdený
subunit2gtk: příkaz nenalezen
subunit2gtk: команда не найдена
subunit2gtk: командата не е открита
subunit2gtk: 命令找不到
subunit2gtk: コマンドが見つかりません