runcon: 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/runcon - from package: coreutils

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

On Debian possible default full paths are:

/usr/bin/runcon - from package: coreutils

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

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