setup-plt: 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/setup-plt - from package: racket

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