Internet speed really slow in linux but not in Windows
Solution 1:
Please check to see if two possibly conflicting drivers are loaded:
lsmod | grep rtl
If you find that both rtl8192cu and rtl8xxxu are loaded, then blacklist one:
sudo -i
echo "blacklist rtl8192cu" >> /etc/modprobe.d/blacklist.conf
exit
After making this change, reboot and let us hear the result.