How to use Mini ISO to perform a clean Ubuntu 20.04 or 18.04 installation via Unity

Ubuntu 18.04 is the first long-term version of Ubuntu that uses Gnome as the default desktop instead of Unity. Although you can still install Unity from the repository, you may not want to install the entire Gnome desktop with Unity. [[Edit]]This article has been updated to include instructions for creating a clean Ubuntu 20.04 using Unity installation. This article is for those who want to install Ubuntu 20.04 / 18.04 using Unity instead of Gnome (Shell). It explains how to perform an Ubuntu 20.04/18.04 LTS installation using Unity and all its dependencies by default, but there is no standard/default (for Gnome desktop) the entire Gnome desktop package available in Ubuntu 20.04 or 18.04 installation.
For this, we will use Ubuntu mini.iso (Netboot image), perform a minimal installation without any desktop environment, and then install the dependent Ubuntu Unity desktop.
Using these instructions, you will get the complete Unity desktop environment and its default applications, including LibreOffice, Thunderbird, Firefox, Nautilus (files), Ubuntu software applications, default Unity indicator, LightDM login and lock screen, etc. . You don’t need to delete any packages or switch between GDM and LightDM.Before installing Ubuntu 18.04 with Unity, you should understand the following:

  • Using Ubuntu mini.iso requires the installer to provide an effective Internet connection, because the smallest ISO images are downloaded from the online archive during installation, rather than installing them from the ISO itself. When launching the newly installed Ubuntu 20.04 / 18.04 minimum version for the first time, you also need a valid Internet connection to install Unity from the command line.
  • The Ubuntu mini.iso installer is text based. If you have not used this type of installer before, please be assured that it is very easy to use.
  • By default, the Ubuntu Netboot image (mini.iso) does not support UEFI. There is a simple Solution If you want to boot in UEFI mode, do the following: create a bootable USB from mini.ISO, then copy the EFI folder from the full Ubuntu 20.04/18.04 ISO (you need to mount it to copy the EFI folder) to USB memory stick. I didn’t try it.

How to use the Netboot installer (mini.iso) to perform a brand new Ubuntu 20.04 or 18.04 installation using Unity instead of the GNOME desktop

1. Download the Ubuntu Netboot image.

  • Ubuntu 20.04: Download the mini.iso file of Ubuntu 20.04 From this link
  • Ubuntu 18.04: You need to download the mini.iso file of the architecture you want to use Here (If you don’t know what that is, you will need the mini.iso file from the “amd64” link/folder)

2. Create bootable media from the mini.iso image file.
you can use it Etcher, This is a GUI tool that can create bootable USB from Linux, Windows or Mac. Alternatively, you can use dd or bootiso to create a bootable USB drive from the command line. 3. Use the mini.iso image to install Ubuntu 20.04 / 18.04 minimally.
Start the installation from a bootable USB (choose “Install” from the boot screen) and follow the instructions on the screen:Ubuntu 18.04 Netboot installer Mini-iso

To use TAB Key to browse text-based installers and Space If you need to select/check boxes, press the key.
When you arrive Software selection Section, do not select any software to install from the list. But press TAB Key and select Continue:Ubuntu netboot installer selects the software to be installed

You may ask why. That’s because you only need Ubuntu 18.04 basics. For some reason, Unity is not listed in the software selection on this screen (unlike other desktops (such as MATE Minimum or MATE Desktop, Ubuntu Studio desktop, Kubuntu full, etc.), so we have to install it later. 4. Restart, Delete the installation media, boot to the newly installed Ubuntu 18.04 minimal, and log in from the command line.Ubuntu 18.04 tty login

After the installation is complete, restart the system, remove the installation media, and then a TTY (terminal) should be displayed, as shown in the screenshot above, asking you to log in. Enter the user name and the password entered during the installation process when prompted 5. Install the complete Unity desktop.Ubuntu 18.04 tty install unified desktop

After logging in to TTY in the previous step, it is time to install the full Ubuntu Unity desktop. To do this, type the following command:

sudo apt install ubuntu-unity-desktop

On Ubuntu 20.04, a screen will be displayed asking you to choose the default display manager between lightdm and gdm3:How to use Mini ISO to perform a clean Ubuntu 20.04 or 18.04 installation via Unity

When entering this screen, press TAB Select lightdm,then press Enter The key to proceed. 6. Restart and log in to your Unity desktop.
To restart the computer, type the following command:

sudo reboot

After restarting the computer, you should no longer see TTY, but should display the LightDM login screen, allowing you to log in to the Ubuntu Unity session:Ubuntu 18.04 Unity LightDM login screen

Unity loads for the first time and displays keyboard shortcut overlays on Ubuntu 18.04 LTS:Ubuntu 18.04 Unity

Unity is installed on Ubuntu 20.04 LTS (Focal Fossa):Ubuntu 20.04 UnityExtra tip for Ubuntu 20.04 with Unity users: You can let Unity use the new Ubuntu Yaru GTK and icon themes. Unity yaru theme on Ubuntu 20.04

For this, please install yaru-theme-unity Software package, which adds Yaru theme support to Unity and Yaru GTK themes:

sudo apt install yaru-theme-unity yaru-theme-gtk

Now, use the following command to change the GTK theme to Yaru:

gsettings set org.gnome.desktop.interface gtk-theme Yaru

Or, if you want to set it to Yaru-dark (the dark variant of Yaru):

gsettings set org.gnome.desktop.interface gtk-theme Yaru-dark

If you want to return to the default Unity Ambiance theme, please use:

gsettings set org.gnome.desktop.interface gtk-theme Ambiance

Related (although some things are unique to Gnome Shell, many things are also applicable to other desktop environments, including Unity):

  • Main things to do after taking full advantage of Ubuntu 20.04 Focal Fossa
  • The first thing to do after installing Ubuntu 18.04 Bionic Beaver

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