When i turn on my PC it shows me in the right way the when i insert my crypto password (using lvm encryption) it doesn't do nothing at all, and if i change the tty i can see my password in plaintext like a command in a clean shell. The only way i cant boot to xubuntu is via ubuntu recovery i cant insert my crypto key there! I think that this is related with kernels version or img!! My xubuntu is a 16.04 and it works in 4.15.0-45-generic kernel.
Thanks in advance!!