Problems With Graphical Login 25.10

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Same problem here with Kubuntu 25.10 and a Dell Latitude 3470. Firmware from 2022 and I recently checked Dell.com for updates and there is no newer firmware. service sddm restart doesn’t show me the graphical login screen. Screen gets black briefly and then I’m back in my text console shell.
I tried xdm and got the same problem. I tried a clean install from USB and got the same problem so it’s not just related to the upgrade process.

If I do “dmesg” I see lots of messages like this:

pcieport 0000:00:1c.4 AER: Correctable error message received from 0000:02:00.0
PCIe Bus Error: severity=Correctable, type=Data Link Layer
BadDLLP

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Welcome to Ubuntu Discourse :slight_smile:

Kubuntu 25.10 is no longer in development or pre-release so I moved your post to its own topic in the correct category.

Thanks

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I exprienced same issue after updating ubuntu 25.04 to 25.10. I haven’t found why it is happeining, and no fix, but found a workaround.

Workaround to get GUI start:

sudo apt install lightdm
sudo dpkg-reconfigure gdm3

Select lightdm. Reboot. Now gui starts, and login works.

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