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I have a fresh install of Kubuntu (no updates, no configuration beyond installer questions) connected via HDMI to a 4k TV. When I boot, I get the bios screen, then it goes black and I don't see anything further.

I'm confident its booting because I am able to log in with nomodeset some of the time (I can't seem to reliably get to the grub editor screen) and it does run like that, but then I get no screen resolution options.

I'm fairly new to Linux, so how can I fix this? My screen is entirely capable of running 720 or 1080 resolution, how can I make it boot at a safe resolution every time?

MAW74656
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2 Answers2

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The black screen problem is normally caused by some update that didn’t install properly and left the graphical desktop environment in a broken state.

The fix this, open a text console by pressing Ctrl+Alt+F1 and then logging in in text mode. Once you are in, issue these commands to complete the upgrade successfully:

sudo dpkg --configure -a
sudo apt-get update
sudo apt-get upgrade -y
sudo reboot.

Ubuntu restarts, and then you can log in again normally.

If issues still exists, please let us know.

Naga2Raja
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Firstly, I would try hooking it up to a monitor via VGA before using HDMI as HDMI requires specific resolutions for HD output and you don't seem to be getting to the login screen to change it further. Also, GRUB is able to set the resolution during startup, so if you believe it is a resolution issue, you can try setting it from GRUB.

Im summarizing what was written here: Change boot screen resolution

1) login to bash shell as root

2) nano /etc/default/grub

3) There is a line that has: GRUB_GFXMODE={resolution}, change the resolution to the desired resolution here. Control+X to exit and type s to save.

4) To keep this resolution, you have to edit /etc/grub.d/00_header. Edit this file with Nano, under the line that has: set gfxmode=${GRUB_GFXMODE}, write: set gfxpayload=keep. Save file as before.

5) Run update-grub command

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madechai
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