Ubuntu – Black Screen after Installing Ubuntu 20.04 LTS

20.04dual-bootlenovorebootsoftware installation

I just installed ubuntu 20.04 lts. There was no problem during the installation process. But after the reboot and choosing Ubuntu at the grub menu (I also use windows 10), it's just nothing, only black screen. I have tried to edit the command and added "nomodeset" like the others told. But nothing's changed.

My laptop is Lenovo g405s, AMD A8 processor, Amd Radeon graphic card, and using legacy mode

Best Answer

  • I have updated Ubuntu 19.10 to 20.04 on my laptop Dell Latitude 7490. After reboot I had the same problem.

    Machine: Dell Latitude 7490

    Dual boot Ubuntu 20.04 + Windows 10 (it was working fine with 19.10)

    Bios: Uefi, security OFF.

    I tried:

    1. –°hanging boot mode from here and boot settings from here - Ubuntu 20.04 black screen after installing, no booting
    2. Booting from Advanced options for Ubuntu different kernels - How to access Advanced Options in GRUB?

    None of the steps helped

    Then I did next:

    1. Boot from Live USB Ubuntu
    2. Install Boot-Repair - http://ubuntuhandbook.org/index.php/2016/11/install-boot-repair-ppa-fix-boot-problems/
    3. Run Boot-Repair
    4. Choose "Recommended repair"
    5. Programm recomended execute some commands in terminal - I did it
    6. Run Boot-Repair again
    7. Choose "Recommended repair"
    8. Programm recomended execute some commands in terminal again - I did it
    9. Boot-Repair print this messege

    An error occurred during the repair.

    Please write on a paper the following URL: https://paste.ubuntu.com/p/sfyBwkyNGV/

    In case you still experience boot problem, indicate this URL to: boot.repair@gmail.com

    You can now reboot your computer. Please do not forget to make your BIOS boot on sda1/EFI/ubuntu/shimx64.efi file!

    If your computer reboots directly into Windows, try to change the boot order in your BIOS. If your BIOS does not allow to change the boot order, change the default boot entry of the Windows bootloader. For example you can boot into Windows, then type the following command in an admin command prompt: bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi

    1. Reboot
    2. Success!
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