check-module: 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-module - from package: gnulib

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

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