nautilus-autorun-software: 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 CentOS possible default full paths are:

/usr/bin/nautilus-autorun-software - from package: nautilus

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/nautilus-autorun-software - from package: nautilus

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

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