I rebuilt my hardware awhile back and reinstalled Ubuntu. I hadn't reinstalled TMG as I'm transitioning away from it, due in part to the v8 installer issue and lack of Unicode support.
I just tried reinstalling now and had the same issues -- v8 installer doesn't work; v7 does. I'm running Kubuntu 11.10/Wine 1.2.3. I recall having the blank line issue in the past, but not how to reproduce it, so I'm not sure if I still have it.
v7 still runs under Wine 1.2.3, though all I've done is fire it up and look at the sample data.