bno_plot: 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/bno_plot - from package: blktrace

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

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