I am also confirming that workaround described in Comment #24 worked for me. My situation was similar with #47 (was installing ubuntu 11.10 amd64, into encrypted lvm volume, with separate non-encrypted boot partition).
I am also confirming that workaround described in Comment #24 worked for me.
My situation was similar with #47 (was installing ubuntu 11.10 amd64, into encrypted lvm volume, with separate non-encrypted boot partition).