I've found out this is more than just LVM. Apparently a several packages that the installer refers to (including lvm, grub, and the kernel) do not pass the GPG verification, so the installer fails.
-- [Gutsy 20070907] alternate install on x86 fails when using LVM https://bugs.launchpad.net/bugs/138034 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs