cryptmount-setup: 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

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/sbin/cryptmount-setup - from package: cryptmount

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