selinux_check_securetty_context: 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 Debian possible default full paths are:

/usr/sbin/selinux_check_securetty_context - from package: selinux-utils

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

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