administration

Ubuntu 20.04 System Backup and Restore

Ubuntu 20.04 System Backup and Restore

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In this tutorial we will use Timeshift to create the full system backup snapshot of Ubuntu 20.04 system. Furthermore, you will learn how to restore from your previously created backup snapshot.

In this tutorial you will learn:

  • How to create full system backup snapshot
  • How to restore from backup snapshot
  • How to create and restore backup from the command line

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Configure sudo without password on Ubuntu 20.04 Focal Fossa Linux

Configure sudo without password on Ubuntu 20.04 Focal Fossa Linux

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In this tutorial you will learn how to configure sudo without the password. Meaning that the sudo command will not prompt you to enter password hence rendering your sudo command completely passwordless.

WARNING
Configuring your sudo command with no password may lead to a security breach, hence leaving your system and data compromised. You are adviced not to proceed with sudo passwordless configuration!

In this tutorial you will learn:

  • How to disable password for the sudo command
  • How to disable sudo password for a specific administrative commands

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docker-RHEL 8 / CentOS 8

How to install Docker CE on RHEL 8 / CentOS 8

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The latest release of the RHEL 8 / CentOS 8. Red Hat has built its own tools, buildah and podman, which aim to be compatible with existing docker images and work without relying on a daemon, allowing the creation of containers as normal users, without the need of special permissions (with some limitations: e.g. at the moment of writing, it’s still not possible to map host ports to the container without privileges).

Some specific tools, however, are still missing: an equivalent of docker-compose, for example does not exists yet. In this tutorial we will see how to install and run the original Docker CE on Rhel8 by using the official Docker repository for CentOS7.

In this tutorial you will learn:

  • How to enable the docker-ce repository on RHEL 8 / CentOS 8
  • How to install docker and docker-compose on RHEL 8 / CentOS 8

docker-RHEL 8 / CentOS 8

Docker installed on RHEL 8 / CentOS 8

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Ubuntu 20.04 GPG error: The following signatures couldn't be verified

Ubuntu 20.04 GPG error: The following signatures couldn’t be verified

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The Ubuntu 20.04 GPG error: The following signatures couldn't be verified is a most common error when attempting to include third party package repositories to the apt package manager.

The GPG error should rather be treated as a warning against potential package installation from unknown sources. Therefore, the GPG error message prompts the user to verify and manually import the third party signature belonging to relevant package developer.

In this tutorial you will learn:

  • How to import public key signature

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Create bootable Ubuntu 20.04 USB startup disk

Create bootable Ubuntu 20.04 USB startup disk

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In this tutorial you will learn how to create a bootable Ubuntu 20.04 USB startup disk. Two methods of bootable Ubuntu 20.04 USB startup disk creation will be shown. To be specific we will be creating a bootable Ubuntu 20.04 USB using any existing Ubuntu Desktop or by using command line on any GNU/Linux distribution.

In this tutorial you will learn:

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test Internet connection on Linux

How to test Internet connection on Linux

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In this tutorial you will learn how to test internet connection on Linux operating system. When we talk about the internet connection usually this for everybody means different thing. Meaning, you might be connected to the Internet but unable to browse any web sites.

In this tutorial you will learn:

  • How to test internet connection
  • How to test DNS resolution
  • How to test Local Area network
  • How to check your DNS resolution

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