geiser-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/geiser-racket - from package: geiser

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

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