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So I switched to Kubuntu with this command: sudo apt install kubuntu-desktop and everything works fine except one thing: the login screen. The login screen is the default one and I don't know how to change it. I tried a few guides but they don't seem to work.

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  • @DKBose That worked! Thanks!
    – Sam Pan
    Mar 31 '20 at 14:57
  • @DKBose can you please comment as an answer so that i can mark this as answered?
    – Sam Pan
    Mar 31 '20 at 14:59
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By default, Ubuntu uses GDM3 (GNOME Display Manager) whereas Kubuntu uses SDDM (Simple Desktop Display Manager).

When you added kubuntu-desktop, you may have been offered the option to select either display manager and you may have chosen GDM3.

Now that you want SDDM, simply run

sudo dpkg-reconfigure sddm

See https://www.linuxuprising.com/2018/12/how-to-change-default-display-manager.html.

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