candump: 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/candump - from package: can-utils

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

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