How To Disable Ipv6 In Linux (Ubuntu) To Improve Internet Speeds

This tutorial should help you successfully disable ipv6 in linux . ipv6 is still not used by isp's so it isnt quite required as of now . Disabling ipv6 has improved internet connection and DNS speeds for many linux (ubuntu) users . SO if you face horrible internet speeds and you have tried CHANGING DNS SERVERS and MTU Values then this is one more thing you can try :) . SO here's how you disable ipv6 in linux :

Step 1 : Go to The Terminal(Applications->Accessories->Terminal)
Step 2 : Type the command sudo gedit /etc/modprobe.d/bad_list/
Step 3 : Gedit should open a new window with the bad_list file .
Step 4 : Add alias net-pf-10 off to the file
Step 5 : Save and Quit
Step 6 : Reboot Your Machine
Step 7 : This should do it!!

To confirm Ipv6 is Disabled

Step 1 : Go to The Terminal(Applications->Accessories->Terminal)
Step 2 : Type ip a | grep inet6

If you see an output then ipv6 is still not disabled , if you dont then congratulations ipv6 is successfully disabled!!