cryptdisks_start: 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:

/sbin/cryptdisks_start - from package: cryptsetup
/usr/sbin/cryptdisks_start - from package: cryptsetup

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