raco: 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/raco - from package: racket

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

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