mueval-core: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/mueval-core - from package: mueval

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