numround: 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
/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/numround - from package: num-utils

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