cryptsetup: 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 CentOS possible default full paths are:

/sbin/cryptsetup - from package: cryptsetup-luks

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/cryptsetup - from package: cryptsetup-bin

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

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