check-mir: 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-mir - from package: ubuntu-dev-tools

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

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