Error: Error detected in the current theme that could interfere with system login process.

[noisek]

Error: Error detected in the current theme that could interfere with system login process.

[NoiSek]

What you're seeing is the testing platform for lightdm, rather than the actual lightdm daemon. The preview system is pretty thoroughly broken last I checked, but it should still work just fine once you actually enable and use it with sudo dpkg-reconfigure lightdm.

Remember that if you run into any issues, you can always bail out to the terminal itself with Ctrl + Alt + f2 (or f3 - f9)

[TophC7]

Oh, i know im using it in testing rn but like i said i ran it with dm-tool add-nested-seat because i couldn't find a way to screenshot the actual lightdm login screen. The error im showing here i still get it running lightdm normally.

[NoiSek]

Were you able to get this working eventually? I would suggest that you test out other themes and see if you have the same issues otherwise just to make sure that this isn't a permissions issue.

[out386]

I had the same thing. It got solved for me after renaming the theme directory from "Aeter" to "lightdm-webkit-theme-aether".