Surf the Web Faster by Disabling IPV6 in Ubuntu Linux
IPV6 is an Internet protocol. Currently most applications use IPV4 and this can cause conflicts which slow down your system.
Complete the following to disable it.
sudo gedit /etc/modprobe.d/bad_list
and type this in:
alias net-pf-10 off
Then save the file.
This work by James House is licensed under a Creative Commons Attribution-Share Alike 3.0 United States License.
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This site is intended for users, looking for solutions, fixes, tweaks to get things working just they way they should. User experiences are all here along with other helpful information for the new and experienced Linux (Ubuntu) user. 
Another issue to improve speed it to change the Ubuntu journaling system to data=writeback system.
* Open your Grub boot menu.
sudo nano -w /boot/grub/menu.lst
* Look for the Defoptions and Altoptions and make them look like the entry below.
# defoptions=quiet splash rootflags=data=writeback
# altoptions=(recovery mode) single rootflags=data=writeback
* You need to update your Grub since you have altered it.
sudo update-grub
* Now we are going to edit the Fstab because it will be expecting these options.
sudo nano -w /etc/fstab
* Now you are going to want to add the (data=writeback and noatime=0) flags to your hard drive. It might be a little confusing because of the new naming system. Look for the (,errors=remount-ro) and add it afterwards to make it look like our example.
defaults,errors=remount-ro,data=writeback,noatime 0
* Now you tell your system to use them both.
sudo tune2fs -o journal_data_writeback /dev/yourdrive