My wired internet connection is working but wireless is not. I can see wireless networks but when try to connect it just doesn't connect. After I tried several things it finally connected once, but the speed was so poor that it almost wasn't working at all. I tried approaches from
- https://help.ubuntu.com/community/WICD
- https://github.com/pvaret/rtl8192cu-fixes
- https://help.ubuntu.com/community/WICD#Reverting_to_NetworkManager
After installing WICD I was not able to see any network icon, usually on desktop screen top right corner. Ubuntu stopped detecting the wifi adapter. After I revoked the switch to WICD, I am back to the the original situation.
I'm able to see wireless networks. I don't think this is an authentication problem (password encryption on router and Ubuntu).