kprobe: 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/kprobe - from package: perf-tools-unstable

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

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