xneur: 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/xneur - from package: xneur

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