Here's a reasonable guess of the necessary steps, though this is not the sequence I actually used.
Installing Casino Verite under Wine for Ubuntu Linux
1) Install MFC40.DLL (you may want to use
winetricks for this.)
2) Install
MS Agent.
3) Install CVBJ.
4) Disable any advanced graphics desktop handling in Ubuntu. (System / Preferences / Appearance / Visual Effects / None)
5) Run CVBJ using the new desktop icon.
Cassie is still missing, but the rest of the program seems to function fine.
I think I'll probably stick with rebooting into Windows, but it is nice to have an option.