In Ubuntu 13.10 I can no longer connect to the internet server for neither my home internet nor the mobile hotspot from my Verizon phone. I however have no trouble connecting to wifi at my university, and my Windows 7 partition also has no trouble connecting. It acknowledges the signal and "connects" in both cases, but my browser will not connect to the server, nor does my Dropbox update, etc. Neither of my roommates (both Mac) have had trouble connecting to the wireless. The change was sudden, and didn't necessarily correspond to a recent update. My device is a Lenovo T420s, and Realtek 8188CE.
In attempt to troubleshoot I've tried...
Using the ethernet cable, no avail.
Hard resetting the router, turning off password restriction, etc., no avail.
Using a MediaLink USB wireless adapter, no avail.
Updating my Kernel from 13.11->13.12 (as suggested in a few forums), no avail.