Though not real hardware, I can somewhat reliably get random hangs that require a keyboard event by creating an x86_64 kvm virtual machine with 4000MB non-preallocated disk, 256MB ram and 2 vcpus. The installer continues after a keyboard event, and this is not specific to lvm+encrypt. I see it often before the partitioner comes up.
Though not real hardware, I can somewhat reliably get random hangs that require a keyboard event by creating an x86_64 kvm virtual machine with 4000MB non-preallocated disk, 256MB ram and 2 vcpus. The installer continues after a keyboard event, and this is not specific to lvm+encrypt. I see it often before the partitioner comes up.