Comment 0 for bug 1761471

hello
i want to install bionic on a usb support.
I want to make a encrypted installation.

i make a partition like /dev/mapper/sdb4_crypt
but it is impossible to store root directory on it

You can see this discussion https://forum.ubuntu-fr.org/viewtopic.php?id=2024502

maybe this error can help
"bd_crypto_luks_close called but not implemented"