ovs-parse-backtrace: 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/bin/ovs-parse-backtrace - from package: openvswitch-common

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

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