Lucid isn't support yet, afaik, and has experimental support in the WS tech preview:
Can you give that a whirl?
VMware vExpert 2009
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Sure I can, here I go: I have installed VMware Workstation e.x.p build-240242 on the host Windows 7 Ultimate 64 Bit and then I did installed the guest Ubuntu 10.04 Lucid Lynx 64 Bit RC.
Unfortunaly, the same issue continues to ocurr.
I saw the posts at http://communities.vmware.com/thread/263410?tstart=0 so I was able to logon using the virtual keyboard and then changed the keyboard layout.
Nobody told me this simple trick early, unfortunaly.