ovs-bugtool: 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/sbin/ovs-bugtool - from package: openvswitch-common

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

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