[Bug 1787625] [NEW] upgrading from Kubuntu 16.04 to 18.04 removes lightdm-kde-greeter, but does not install sddm

[andrearuggirello]

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

Status in sddm package in Ubuntu:
  New
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  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...

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