Regarding the Samsung 511, although I am not familiar with that specific model I have two other Samsung netbooks (N150 and NF310), and I suspect that the 511 most likely has a Broadcom 4313 wireless adapter. That requires the brcm80211 driver, which as far as I know is still not included in the VL7B2 distribution.
If it is any consolation, I have tested both of my Samsung sytems with a variety of other Linux distributions which do include the brcm80211 driver, and they work very well. So hopefully all will be well once the driver makes it into VL.
While it is possible to get the 4313 adapter working with the older "wl" or "broadcom-wl" driver (aka "STA" on Ubuntu), there are serious performance problems with it, and the throughput very low.