check-support-status: 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/bin/check-support-status - from package: debian-security-support

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

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