algotutor: 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/algotutor - from package: algotutor

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