E:Malformed entry 1 in sources file /etc/apt/sources.list.d/third-party.sources (URI parse), E:The list of sources could not be read

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Hi again, @NilleB :slight_smile:

Thanks for the outputs. Could you please try to run the following command:

sudo dpkg-reconfigure lightdm

... and then reboot?

I'm suggesting that because that was the working solution posted by @ironfoot in a somewhat similar (but different) scenario (upgrade from Ubuntu MATE 24.04 LTS to Ubuntu MATE 24.10):

And to take another good suggestion by @ironfoot in that other topic, could you also please include, in your reply, the output of the following command:

lightdm --show-config

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