Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Ubuntu 20.04 Essentials
  • Table Of Contents Toc
Ubuntu 20.04 Essentials

Ubuntu 20.04 Essentials

By : Neil Smyth
Buy this Book
close
close
Ubuntu 20.04 Essentials

Ubuntu 20.04 Essentials

By: Neil Smyth
Buy this Book

Overview of this book

Ubuntu is undeniably one of the most highly regarded and widely used Debian-based Linux distributions available today. Thanks to its ease of use and reliability, Ubuntu has a loyal following of Linux users and an active community of developers. Ubuntu 20.04 Essentials is designed to take you through the installation, use, and administration of the Ubuntu 20.04 distribution in detail. For beginners, the book covers topics such as operating system installation, the basics of the GNOME desktop environment, configuring email and web servers, and installing packages and system updates. Additional installation topics such as dual booting with Microsoft Windows are also covered along with crucial security topics such as configuring a firewall and user and group administration. For the experienced user, the book delves into topics such as remote desktop access, the Cockpit web interface, logical volume management (LVM), disk partitioning, and swap management. Further, it also explores KVM virtualization, Secure Shell (SSH), Linux containers, and file sharing using both Samba and NFS to provide a thorough overview of this enterprise-class operating system.
Table of Contents (38 chapters)
close
close
close
1
1. Introduction
Icon
1. Introduction
Icon
1.1 Superuser Conventions
Icon
1.2 Opening a Terminal Window
Icon
1.3 Editing Files
Icon
1.4 Feedback
Icon
1.5 Errata
Lock Free Chapter
2
2. A Brief History of Linux
Icon
2. A Brief History of Linux
Icon
2.1 What exactly is Linux?
Icon
2.2 UNIX Origins
Icon
2.3 Who Created Linux?
Icon
2.4 The History of Ubuntu
Icon
2.5 What does the word “Ubuntu” Mean?
Icon
2.6 Summary
3
3. Installing Ubuntu on a Clean Disk Drive
Icon
3. Installing Ubuntu on a Clean Disk Drive
Icon
3.1 Ubuntu Installation Options
Icon
3.2 Server vs. Desktop Editions
Icon
3.3 Obtaining the Ubuntu Installation Media
Icon
3.4 Writing the ISO Installation Image to a USB Drive
Icon
3.5 Booting from the Ubuntu USB Image
Icon
3.6 Installing Ubuntu
Icon
3.7 Accessing the Ubuntu Desktop
Icon
3.8 Installing Updates
Icon
3.9 Displaying Boot Messages
Icon
3.10 Summary
4
4. Installing Ubuntu with the Network Installer
Icon
4. Installing Ubuntu with the Network Installer
Icon
4.1 Network Installer Advantages
Icon
4.2 Obtaining the Network Installer Image
Icon
4.3 Booting from the Installer Image
Icon
4.4 Performing the Installation
Icon
4.5 Disk Partitioning
Icon
4.6 Software Collection Selection
Icon
4.7 Installing Software Collections After System Setup
Icon
4.8 Summary
5
5. Dual Booting Ubuntu with Windows
Icon
5. Dual Booting Ubuntu with Windows
Icon
5.1 Beginning the Ubuntu Installation
Icon
5.2 Booting Ubuntu for the First Time
Icon
5.3 Changing the Default Boot Option
Icon
5.4 Accessing the Windows Partition from the Command-line
Icon
5.5 Accessing the Windows Partition from the Desktop
Icon
5.6 Summary
6
6. Allocating Windows Disk Partitions to Ubuntu
Icon
6. Allocating Windows Disk Partitions to Ubuntu
Icon
6.1 Unmounting the Windows Partition
Icon
6.2 Deleting the Windows Partitions from the Disk
Icon
6.3 Formatting the Unallocated Disk Partition
Icon
6.4 Mounting the New Partition
Icon
6.5 Editing the Boot Menu
Icon
6.6 Using the GNOME Disks Utility
Icon
6.7 Summary
7
7. A Guided Tour of the GNOME 3 Desktop
Icon
7. A Guided Tour of the GNOME 3 Desktop
Icon
7.1 Installing the GNOME Desktop
Icon
7.2 An Overview of the GNOME 3 Desktop
Icon
7.3 Launching Activities
Icon
7.4 Managing Windows
Icon
7.5 Using Workspaces
Icon
7.6 Calendar and Notifications
Icon
7.7 Desktop Settings
Icon
7.8 Customizing the Dash
Icon
7.9 Switching to Dark Mode
Icon
7.10 Installing Ubuntu Software
Icon
7.11 Beyond Basic Customization
Icon
7.12 Summary
8
8. An Overview of the Ubuntu Cockpit Web Interface
Icon
8. An Overview of the Ubuntu Cockpit Web Interface
Icon
8.1 An Overview of Cockpit
Icon
8.2 Installing and Enabling Cockpit
Icon
8.3 Accessing Cockpit
Icon
8.4 Overview
Icon
8.5 Logs
Icon
8.6 Storage
Icon
8.7 Networking
Icon
8.8 Accounts
Icon
8.9 Services
Icon
8.10 Applications
Icon
8.11 Virtual Machines
Icon
8.12 Software Updates
Icon
8.13 Terminal
Icon
8.14 Connecting to Multiple Servers
Icon
8.15 Summary
9
9. Using the Bash Shell on Ubuntu
Icon
9. Using the Bash Shell on Ubuntu
Icon
9.1 What is a Shell?
Icon
9.2 Gaining Access to the Shell
Icon
9.3 Entering Commands at the Prompt
Icon
9.4 Getting Information about a Command
Icon
9.5 Bash Command-line Editing
Icon
9.6 Working with the Shell History
Icon
9.7 Filename Shorthand
Icon
9.8 Filename and Path Completion
Icon
9.9 Input and Output Redirection
Icon
9.10 Working with Pipes in the Bash Shell
Icon
9.11 Configuring Aliases
Icon
9.12 Environment Variables
Icon
9.13 Writing Shell Scripts
Icon
9.14 Summary
10
10. Managing Ubuntu Users and Groups
Icon
10. Managing Ubuntu Users and Groups
Icon
10.1 User Management from the Command-line
Icon
10.2 User Management with Cockpit
Icon
10.3 User Management using the Settings App
Icon
10.4 Summary
11
11. Managing Ubuntu systemd Units
Icon
11. Managing Ubuntu systemd Units
Icon
11.1 Understanding Ubuntu systemd Targets
Icon
11.2 Understanding Ubuntu systemd Services
Icon
11.3 Ubuntu systemd Target Descriptions
Icon
11.4 Identifying and Configuring the Default Target
Icon
11.5 Understanding systemd Units and Unit Types
Icon
11.6 Dynamically Changing the Current Target
Icon
11.7 Enabling, Disabling and Masking systemd Units
Icon
11.8 Working with systemd Units in Cockpit
Icon
11.9 Summary
12
12. Ubuntu Software Package Management and Updates
Icon
12. Ubuntu Software Package Management and Updates
Icon
12.1 Repositories
Icon
12.2 Managing Repositories with Software & Updates
Icon
12.3 Managing Packages with APT
Icon
12.4 Performing Updates
Icon
12.5 Enabling Automatic Updates
Icon
12.6 Enabling Livepatch
Icon
12.7 Summary
13
13. Ubuntu Snap Package Management
Icon
13. Ubuntu Snap Package Management
Icon
13.1 Managing Software with Snap
Icon
13.2 Basic Snap Commands
Icon
13.3 Working with Snap Channels
Icon
13.4 Snap Refresh Schedule
Icon
13.5 Snap Services
Icon
13.6 Summary
14
14. Ubuntu Network Management
chevron up
Icon
14. Ubuntu Network Management
Icon
14.1 An Introduction to NetworkManager
Icon
14.2 Installing and Enabling NetworkManager
Icon
14.3 Basic nmcli Commands
Icon
14.4 Working with Connection Profiles
Icon
14.5 Interactive Editing
Icon
14.6 Configuring NetworkManager Permissions
Icon
14.7 Summary
15
15. Ubuntu Firewall Basics
Icon
15. Ubuntu Firewall Basics
Icon
15.1 Understanding Ports and Services
Icon
15.2 Securing Ports and Services
Icon
15.3 Ubuntu Services and iptables Rules
Icon
15.4 Well Known Ports and Services
Icon
15.5 Summary
16
16. Using gufw and ufw to Configure an Ubuntu Firewall
Icon
16. Using gufw and ufw to Configure an Ubuntu Firewall
Icon
16.1 An Overview of gufw and ufw
Icon
16.2 Installing gufw on Ubuntu
Icon
16.3 Running and Enabling gufw
Icon
16.4 Creating a New Profile
Icon
16.5 Adding Preconfigured Firewall Rules
Icon
16.6 Adding Simple Firewall Rules
Icon
16.7 Adding Advanced Rules
Icon
16.8 Configuring the Firewall from the Command Line using ufw
Icon
16.9 Summary
17
17. Basic Ubuntu Firewall Configuration with firewalld
Icon
17. Basic Ubuntu Firewall Configuration with firewalld
Icon
17.1 An Introduction to firewalld
Icon
17.2 Checking firewalld Status
Icon
17.3 Configuring Firewall Rules with firewall-cmd
Icon
17.4 Managing firewalld using firewall-config
Icon
17.5 Summary
18
18. Configuring SSH Key-based Authentication on Ubuntu
Icon
18. Configuring SSH Key-based Authentication on Ubuntu
Icon
18.1 An Overview of Secure Shell (SSH)
Icon
18.2 SSH Key-based Authentication
Icon
18.3 Setting Up Key-based Authentication
Icon
18.4 Installing and Starting the SSH Service
Icon
18.5 SSH Key-based Authentication from Linux and macOS Clients
Icon
18.6 Managing Multiple Keys
Icon
18.7 SSH Key-based Authentication from Windows 10 Clients
Icon
18.8 SSH Key-based Authentication using PuTTY
Icon
18.9 Generating a Private Key with PuTTYgen
Icon
18.10 Installing the Public Key for a Google Cloud Instance
Icon
18.11 Summary
19
19. Ubuntu Remote Desktop Access with Vino
Icon
19. Ubuntu Remote Desktop Access with Vino
Icon
19.1 Remote Desktop Access Types
Icon
19.2 Secure and Insecure Remote Desktop Access
Icon
19.3 Enabling Remote Desktop Access on Ubuntu
Icon
19.4 Connecting to the Shared Desktop
Icon
19.5 Connecting from Non-Linux Clients
Icon
19.6 Establishing a Secure Remote Desktop Session
Icon
19.7 Establishing a Secure Tunnel on Windows using PuTTY
Icon
19.8 Summary
20
20. Ubuntu Remote Desktop Access with VNC
Icon
20. Ubuntu Remote Desktop Access with VNC
Icon
20.1 Installing the GNOME Desktop Environment
Icon
20.2 Installing VNC on Ubuntu
Icon
20.3 Configuring the VNC Server
Icon
20.4 Starting the VNC Server
Icon
20.5 Connecting to a VNC Server
Icon
20.6 Summary
21
21. Displaying Ubuntu Applications Remotely (X11 Forwarding)
Icon
21. Displaying Ubuntu Applications Remotely (X11 Forwarding)
Icon
21.1 Requirements for Remotely Displaying Ubuntu Applications
Icon
21.2 Remotely Displaying an Ubuntu Application
Icon
21.3 Trusted X11 Forwarding
Icon
21.4 Compressed X11 Forwarding
Icon
21.5 Displaying Remote Ubuntu Apps on Windows
Icon
21.6 Summary
22
22. Using NFS to Share Ubuntu Files with Remote Systems
Icon
22. Using NFS to Share Ubuntu Files with Remote Systems
Icon
22.1 Ensuring NFS Services are running on Ubuntu
Icon
22.2 Configuring the Ubuntu Firewall to Allow NFS Traffic
Icon
22.3 Specifying the Folders to be Shared
Icon
22.4 Accessing Shared Ubuntu Folders
Icon
22.5 Mounting an NFS Filesystem on System Startup
Icon
22.6 Unmounting an NFS Mount Point
Icon
22.7 Accessing NFS Filesystems in Cockpit
Icon
22.8 Summary
23
23. Sharing Files between Ubuntu and Windows Systems with Samba
Icon
23. Sharing Files between Ubuntu and Windows Systems with Samba
Icon
23.1 Accessing Windows Resources from the GNOME Desktop
Icon
23.2 Samba and Samba Client
Icon
23.3 Installing Samba on an Ubuntu System
Icon
23.4 Configuring the Ubuntu Firewall to Enable Samba
Icon
23.5 Configuring the smb.conf File
Icon
23.6 Creating a Samba User
Icon
23.7 Testing the smb.conf File
Icon
23.8 Starting the Samba and NetBIOS Name Services
Icon
23.9 Accessing Samba Shares
Icon
23.10 Accessing Windows Shares from Ubuntu
Icon
23.11 Summary
24
24. An Overview of Virtualization Techniques
Icon
24. An Overview of Virtualization Techniques
Icon
24.1 Guest Operating System Virtualization
Icon
24.2 Hypervisor Virtualization
Icon
24.3 Virtual Machine Networking
Icon
24.4 Summary
25
25. Installing KVM Virtualization on Ubuntu
Icon
25. Installing KVM Virtualization on Ubuntu
Icon
25.1 An Overview of KVM
Icon
25.2 KVM Hardware Requirements
Icon
25.3 Preparing Ubuntu for KVM Virtualization
Icon
25.4 Verifying the KVM Installation
Icon
25.5 Summary
26
26. Creating KVM Virtual Machines using Cockpit and virt-manager
Icon
26. Creating KVM Virtual Machines using Cockpit and virt-manager
Icon
26.1 Installing the Cockpit Virtual Machines Module
Icon
26.2 Creating a Virtual Machine in Cockpit
Icon
26.3 Starting the Installation
Icon
26.4 Working with Storage Volumes and Storage Pools
Icon
26.5 Creating a Virtual Machine using virt-manager
Icon
26.6 Starting the Virtual Machine Manager
Icon
26.7 Configuring the KVM Virtual System
Icon
26.8 Starting the KVM Virtual Machine
Icon
26.9 Summary
27
27. Creating KVM Virtual Machines with virt-install and virsh
Icon
27. Creating KVM Virtual Machines with virt-install and virsh
Icon
27.1 Running virt-install to build a KVM Guest System
Icon
27.2 An Example Ubuntu virt-install Command
Icon
27.3 Starting and Stopping a Virtual Machine from the Command-Line
Icon
27.4 Creating a Virtual Machine from a Configuration File
Icon
27.5 Summary
28
28. Creating an Ubuntu KVM Networked Bridge Interface
Icon
28. Creating an Ubuntu KVM Networked Bridge Interface
Icon
28.1 Identifying the Network Management System
Icon
28.2 Getting the Netplan Network Settings
Icon
28.3 Creating a Netplan Network Bridge
Icon
28.4 Getting the Current Network Manager Settings
Icon
28.5 Creating a Network Manager Bridge from the Command-Line
Icon
28.6 Declaring the KVM Bridged Network
Icon
28.7 Using a Bridge Network in a Virtual Machine
Icon
28.8 Creating a Bridge Network using nm-connection-editor
Icon
28.9 Summary
29
29. Managing KVM using the virsh Command-Line Tool
Icon
29. Managing KVM using the virsh Command-Line Tool
Icon
29.1 The virsh Shell and Command-Line
Icon
29.2 Listing Guest System Status
Icon
29.3 Starting a Guest System
Icon
29.4 Shutting Down a Guest System
Icon
29.5 Suspending and Resuming a Guest System
Icon
29.6 Saving and Restoring Guest Systems
Icon
29.7 Rebooting a Guest System
Icon
29.8 Configuring the Memory Assigned to a Guest OS
Icon
29.9 Summary
30
30. An Introduction to Linux Containers
Icon
30. An Introduction to Linux Containers
Icon
30.1 Linux Containers and Kernel Sharing
Icon
30.2 Container Uses and Advantages
Icon
30.3 Ubuntu Container Tools
Icon
30.4 The Docker Registry
Icon
30.5 Container Networking
Icon
30.6 Summary
31
31. Working with Containers on Ubuntu
Icon
31. Working with Containers on Ubuntu
Icon
31.1 Installing the Container Tools
Icon
31.2 Pulling a Container Image
Icon
31.3 Running the Image in a Container
Icon
31.4 Managing a Container
Icon
31.5 Saving a Container to an Image
Icon
31.6 Removing an Image from Local Storage
Icon
31.7 Removing Containers
Icon
31.8 Building a Container with Buildah
Icon
31.9 Summary
32
32. Setting Up an Ubuntu Web Server
Icon
32. Setting Up an Ubuntu Web Server
Icon
32.1 Requirements for Configuring an Ubuntu Web Server
Icon
32.2 Installing the Apache Web Server Packages
Icon
32.3 Configuring the Firewall
Icon
32.4 Port Forwarding
Icon
32.5 Starting the Apache Web Server
Icon
32.6 Testing the Web Server
Icon
32.7 Configuring the Apache Web Server for Your Domain
Icon
32.8 The Basics of a Secure Web Site
Icon
32.9 Configuring Apache for HTTPS
Icon
32.10 Obtaining an SSL Certificate
Icon
32.11 Summary
33
33. Configuring an Ubuntu Postfix Email Server
Icon
33. Configuring an Ubuntu Postfix Email Server
Icon
33.1 The structure of the Email System
Icon
33.2 Configuring an Ubuntu Email Server
Icon
33.3 Postfix Pre-Installation Steps
Icon
33.4 Firewall/Router Configuration
Icon
33.5 Installing Postfix on Ubuntu
Icon
33.6 Configuring Postfix
Icon
33.7 Configuring DNS MX Records
Icon
33.8 Starting Postfix on an Ubuntu System
Icon
33.9 Testing Postfix
Icon
33.10 Sending Mail via an SMTP Relay Server
Icon
33.11 Summary
34
34. Adding a New Disk Drive to an Ubuntu System
Icon
34. Adding a New Disk Drive to an Ubuntu System
Icon
34.1 Mounted File Systems or Logical Volumes
Icon
34.2 Finding the New Hard Drive
Icon
34.3 Creating Linux Partitions
Icon
34.4 Creating a File System on a Disk Partition
Icon
34.5 An Overview of Journaled File Systems
Icon
34.6 Mounting a File System
Icon
34.7 Configuring Ubuntu to Automatically Mount a File System
Icon
34.8 Adding a Disk Using Cockpit
Icon
34.9 Summary
35
35. Adding a New Disk to an Ubuntu Volume Group and Logical Volume
Icon
35. Adding a New Disk to an Ubuntu Volume Group and Logical Volume
Icon
35.1 An Overview of Logical Volume Management (LVM)
Icon
35.2 Getting Information about Logical Volumes
Icon
35.3 Adding Additional Space to a Volume Group from the Command-Line
Icon
35.4 Summary
36
36. Adding and Managing Ubuntu Swap Space
Icon
36. Adding and Managing Ubuntu Swap Space
Icon
36.1 What is Swap Space?
Icon
36.2 Recommended Swap Space for Ubuntu
Icon
36.3 Identifying Current Swap Space Usage
Icon
36.4 Adding a Swap File to an Ubuntu System
Icon
36.5 Adding Swap as a Partition
Icon
36.6 Adding Space to an Ubuntu LVM Swap Volume
Icon
36.7 Adding Swap Space to the Volume Group
Icon
36.8 Summary
37
37. Ubuntu System and Process Monitoring
Icon
37. Ubuntu System and Process Monitoring
Icon
37.1 Managing Processes
Icon
37.2 Real-time System Monitoring with htop
Icon
37.3 Command-Line Disk and Swap Space Monitoring
Icon
37.4 Summary
38
Index
Icon
Index

14.6 Configuring NetworkManager Permissions

In addition to making it easier to manage networks on Ubuntu, NetworkManager also allows permissions to be specified for connections. The following command, for example, restricts a connection profile to root and user accounts named john and caitlyn:

# nmcli con mod static_ip connection.permissions user:root,john,caitlyn

Once the connection profiles have been reloaded by NetworkManager, the static_ip connection will only be active and accessible to other users when at least one of the designated users is logged in to an active session on the system. As soon as the last of these users logs out, the connection will go down and remain inactive until one of the users signs back in.

In addition, only users with permission are able to make changes to the connection status or configuration.

CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
Ubuntu 20.04 Essentials
End of Section 14
Next Section
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon