pauker: 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
/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/pauker - from package: pauker

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