[Black Screen after Grub]

[Bastou]

Dear all,

I'm very new to the topic of Linux and am seeking help for an issue I got after installing Kubuntu 25.10 Desktop. (sorry I do it by memory, maybe some wording is incorrect)

> PC: DELL Optiplex 7050
> 2 Storage:
- 1 SSD with Windows inside
- 1 HDD with nothing inside (TOSHIBA MQ01ACF050, 500Go).
- iiyama monitor, plugged by DisplayPort in the GC.

I did what I thought was the simplest : basic install, choose my empty disc
The install went well, with a "Success" window at the end and i now have the Grub menu displayed at launch.



The Issue :
Grub Menu > Selection of Kubuntu GNU/Linux, (first row)

I have a boot screen with : DELL
Kubuntu

Load few (5-7) seconds, then black screen, back to DELL Kubuntu (4-5 secs), black screen, DELL Kubuntu (even less secs) , black screen and finally my monitor says "No input".

> The monitor worked perfectly for the install and still works for Windows
> Launching windows in the Grub does work well.

what I tried :
> Deactivate Secure boot : no change
> Went inside "Advance Options for Kubuntu GNU/Linux :
All the checks seems "OK",
Then I press "Resume".

And after that Linux does launch but "seems" rather slow (I have no point of comparison but, it seems slow for a brand new OS and empty disc) with a long loading screen with "Plasma by KDE" and a gear icon.

Inside Linux, everything seems up to date.


If you have any insight, I would be happy to get your opinion,
Thanks in advance from a newbie.

[skyfishgoo]

what sort of graphics are you using with that machine? is there a dedicated GPU or and integrated GPU from the CPU

both should really work out of the box unless you checked the [x] install proprietary drivers box during the install.

[Bastou]

Thanks for your answer,

There is both :
the integrated GPU from CPU Intel(R) HD Graphics 630
the GPU: AMD Radeon R5 430


During install, I choose : Normal installation and check the box of "Download and install updated following insallation"