In order to check this I grabbed the iso file
and installed a system with 'encrypted disk with LVM' according to the
choice in the partitioning window of the installer. It had a working
plymouth screen when I booted in the installed system. I updated &
upgraded the system to be up to date with the kernel 4.4.0-43-generic.
After reboot there is still a working plymouth screen. See the attached
photo (sorry for the low quality ).
I tested this in a Toshiba laptop bought 2013,
Is this what you are missing? Please try to install from the first point
release (16.04.1 LTS).
** Attachment added: "plymouth-screen_with_cryptsetup-passphrase.jpg"
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cryptsetup password prompt not shown
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