Public bug reported:

Upgrading from Kubuntu 16.04 to 18.04 removes lightdm-kde-greeter, but
does not install sddm.

The problem arised from the fact that lightdm-kde-greeter didn't survive
in 18.04, which is probably fine per se. Hence, do-release-upgrade
prompted me to remove, among other things, lightdm-kde-greeter. I wasn't
bothered, thinking that probably the KDE greeter moved behind the scenes
to some other package. But once rebooted, the system was in an
unpleasant state, since lightdm had no valid greeter to show, and an
endless Kubuntu logo splash screen followed - until I resolved to reboot
after a few minutes. Booting in recovery mode and just running "apt
install sddm" fixed the issue, but a novice user would have a hard time
finding the solution - I'm not sure this is the best way to handle a
graceful migration from lightdm to sddm for KDE users, hence I'm
reporting this bug. Perhaps by making lightdm-kde-greeter a virtual
package implemented by sddm or sddm-theme-breeze we could provide a
smoother experience...

** Affects: sddm (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: sddm (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1787625

Title:
  upgrading from Kubuntu 16.04 to 18.04 removes lightdm-kde-greeter, but
  does not install sddm

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