Ubuntu Linux Toolbox: 1000+ Commands for Power Users (PDF Guide)

This updated bestseller from Linux guru Chris Negus is packed with an array of new and revised material.

As a longstanding bestseller, Ubuntu Linux Toolbox has taught you how to get the most out Ubuntu, the world's most popular Linux distribution. With this anticipated new edition, Christopher Negus returns with a host of new and expanded coverage on tools for managing file systems, ways to connect to networks, techniques for securing Ubuntu systems, and a look at the latest Long Term Support (LTS) release of Ubuntu, all aimed at getting you up and running with Ubuntu Linux quickly.
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Install QEMU on ubuntu 15.04 and mange QEMU with Virt Manager

QEMU is a generic and open source machine emulator and virtualizer.When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance.

When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, and S390 guests.
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Install Freeradius on ubuntu 15.04 Server and manage using daloradius (Freeradius web management application)

RADIUS, which stands for “Remote Authentication Dial In User Service”, is a network protocol -- a system that defines rules and conventions for communication between network devices -- for remote user authentication and accounting. Commonly used by Internet Service Providers (ISPs), cellular network providers, and corporate and educational networks, the RADIUS protocol serves three primary functions:
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