rxdebug: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/rxdebug - from package: openafs-client

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