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This is based on a tutorial found on the Ubuntu forums here and is a summary of the steps needed. For more explanation see the origina; 
1. Go to System>Administation>Synaptic Package Manager
2. Click the Status button (bottom left) then click Residual config.
3. If anything comes up in the right hand window, select it and Mark for Complete Removal, then click Apply.
4. Click [...]

 What to do if an installation fails in Ubuntu
If you stop an installation half-way through, a lock file is created that prevents you from installing anything else. Before you can try again you need to manually unlock the download cache.
1. Open a root terminal and type nautilus /var/cache/apt/archives
2. Right click on the file called lock and delete it
That [...]

 Excel Password Recovery
Often when an employee departs, they take important Excel passwords with them. This guide outlines how to use a simple Excel password recovery application to crack lost or forgotten passwords, allowing you to unlock password-encrypted Microsoft Excel documents quickly as possible.
 Download and Install the Office Password Recovery Utility
To perform the following recovery steps, [...]

One of the biggest security holes you could open on your server is to allow directly logging in as root through ssh, because any cracker can attempt to brute force your root password and potentially get access to your system if they can figure out your password.
To fix this problem, we’ll need to edit the [...]

To enable Path MTU Discovery in Juniper firewalls running Screen OS logon as an admin user and run the following commands:
Set Path MTU
SSG20> set flow path-mtu
SSG20> save
To verify the change
SSG20> get config | incl path
Related posts:How to Create and Manage Access Lists on Cisco ASA and PIX FirewallsHow to Create a PCAP packet capture on [...]

Some users with limited bandwidth may want to use “sneakernet” to update from removable media (such as CD, DVD, or USB memory stick) created on a machine that has a fast internet connection and adequate disk space to hold all updates. To create a CD/DVD containing all the updates follow this procedure.

CentOS-5.2 updates are currently about 3.6 [...]

MySQL stores all its username and password data in a special database named mysql. You can add users to this database and specify the databases to which they will have access with the grant command. The MySQL root or superuser account, which is used to create and delete databases, is the exception. You need to [...]

File configurations for each network device you may have or want to add on your system are located in the /etc/sysconfig/network-scripts/ directory with Red Hat Linux 6.1 or 6.2 and are named ifcfg-eth0 for the first interface and ifcfg-eth1 for the second, etc. Following is a example /etc/sysconfig/network-scripts/ifcfg-eth0 file:
  

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In this section we provide some suggested configurations along with guidelines for their use. We also address the topic of reasonable option setting.

3.1. Sample Configurations

3.1.1. A Caching-only Nameserver
The following sample configuration is appropriate for a caching-only name server for use by clients internal to a corporation. All queries from outside clients [...]

SquirrelMail is a web-based email application started by Nathan and Luke Ehresman[1] and written in the PHP scripting language. It can be installed on almost all web servers as long as PHP is present and the web server has access to an IMAP and SMTP server.
SquirrelMail outputs valid HTML 4.0 for its presentation, making it [...]