racket: 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/racket - from package: racket

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

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