Most desktop environments have an option for auto login under the user settings. That way you only need to decrypt the disk.
dropped_packet
joined 1 month ago
I have never seen an encryption implementation that required two passwords to decrypt the disk.
Is it possible the first one decrypted the disk and the second password was for your user account?
What distribution are you using? The common desktop environments (KDE & Gnome) have simple graphical display configurations similar to what you find in Windows.