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How To Fix Black Screen After Upgrading to Ubuntu 20.04

Ubuntu 16

Ubuntu 20.04 is the latest long-term support (LTS) release of one of the most popular Linux distributions. While it brings many improvements and new features, some users have reported experiencing a black screen after upgrading. This guide will provide you with several methods to resolve this issue.

Understanding the Problem

The black screen issue usually arises after the user logs in. The system boots up fine, but after entering the login credentials, the screen goes black. This can be due to various reasons such as issues with graphics drivers, problematic files in the home directory, or even a corrupted .config/dconf/user file.

Method 1: Removing or Renaming the .config/dconf/user File

One of the common reasons behind the black screen issue is a corrupted .config/dconf/user file. Here is how you can rename or remove it:

  1. Press Ctrl + Alt + F3 to open a terminal.
  2. Log in using your username and password.
  3. Use the following command to navigate to the .config/dconf directory:
cd ~/.config/dconf
  1. Rename the user file using the mv command:
mv user user.bak

This command renames the user file to user.bak. If the user file was causing the problem, this should fix it. Restart your computer and check if the issue persists.

Method 2: Blacklisting the Radeon Driver

If you’re using a Radeon graphics card, the driver could be causing the black screen issue. In this case, you can try blacklisting the Radeon driver. Here’s how:

  1. Open a terminal using Ctrl + Alt + F3.
  2. Log in using your username and password.
  3. Open the blacklist configuration file using the nano text editor:
sudo nano /etc/modprobe.d/blacklist.conf
  1. Add the following line at the end of the file:
blacklist radeon
  1. Save the changes and exit the text editor by pressing Ctrl + X, then Y, and finally Enter.
  2. Reboot your computer.

This method disables the Radeon driver, which could potentially fix the black screen issue.

Method 3: Removing Problematic Files in the Home Directory

Sometimes, specific files in the home directory can cause the black screen issue. To identify the problematic file:

  1. Create a new user and log in with this user. If the issue doesn’t persist, it means the problem lies within your original user’s home directory.
  2. Log in to the terminal using Ctrl + Alt + F3.
  3. Navigate to your home directory and remove or rename files in the .config directory one by one, checking each time if the issue is resolved.
cd ~
mv .config .config.bak

This command renames the .config directory to .config.bak. If this fixes the issue, you can then move files from .config.bak back into .config one by one to identify the problematic file.

Conclusion

The black screen issue after upgrading to Ubuntu 20.04 can be frustrating, but it’s usually solvable. The methods described in this article should help you identify and fix the problem. Always remember to back up your data before making any significant changes to your system. If the issue persists, consider seeking help from the Ubuntu community or professional support.

How do I open a terminal in Ubuntu?

To open a terminal in Ubuntu, you can use the keyboard shortcut Ctrl + Alt + T. This will open the terminal window.

How do I rename a file in the terminal?

To rename a file in the terminal, you can use the mv command followed by the current file name and the desired new file name. For example, to rename a file called "oldfile.txt" to "newfile.txt", you would use the command mv oldfile.txt newfile.txt.

How do I reboot my computer in Ubuntu?

To reboot your computer in Ubuntu, you can use the reboot command in the terminal. Simply type reboot and press Enter. You can also use the graphical user interface (GUI) by clicking on the power icon in the top-right corner of the screen and selecting the "Restart" option.

How do I create a new user in Ubuntu?

To create a new user in Ubuntu, you can use the adduser command in the terminal. Type sudo adduser username (replace "username" with the desired username for the new user) and follow the prompts to set a password and other details for the new user.

How do I remove a file in the terminal?

To remove a file in the terminal, you can use the rm command followed by the file name. For example, to remove a file called "file.txt", you would use the command rm file.txt. Be cautious when using this command, as it permanently deletes the file and cannot be undone.

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