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Here is an overview on howto use ufw the Uncomplicated Firewall:

Lets turn UFW on:
sudo ufw enable

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It seems ipv6 is enabled by default in ubuntu and I’ve also heard that people are complaining that it slows them down. Here is a quick way to get rid of it.

vim /etc/modprobe.d/aliases

Look for the line which says alias net-pf-10 ipv6 and change it to alias net-pf-10 off ipv6

Restart your network or reboot for the change to take effect

SSH is a great way to remotely administer a server. However, it still has a number of issues when you open it up to the world. The server and client communications are secure but that doesn’t mean the hosts involved are. Opening an SSH service to the world allows for brute force attacks and means that the carbon interface is still the weakest link.

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If you want to use service command in ubuntu intrepid install sysvinit-utils package.This package contains the important System-V-like utilities.Specifically, this package includes: killall5, last, lastb, mesg, pidof, service, sulogin.
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Ubucleaner is a simple bash script that help you to keep your computer clean.

Note:- This is Only for advanced Ubuntu users

Ubucleaner Features
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Ubuntu is one of the few Linux distributions out there that will not enable the root account.If you want to do something with root permission on the console you have to type sudo before the command.

sudo” means superuser do. “sudo” will prompt for “Password:”. Please specify user password

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