Further to my comment #3: X ran in parallel with the instance of KDE/Plasma that was started accidentally via kdesudo and/or teamviewer daemon for an hour or two (confusing some software), then X died in the background. Plasma is still running, days later.
"Everything works" was a bit of an approximation. Plasmashell is consuming 105-125% of a processor, 10.3G of virtual RAM, and 0.55G of physical RAM, while Xorg eats ~30-40% of a processor, 500M virtual, 140M RAM. In some cases, selecting a window on the taskbar doesn't work (it sometimes thinks I'm dragging the button I click on), and I've had some issues with copy/paste. I was sufficiently relieved to have plasma again that it took a few days before its dragging bothered me enough to check this. Let me know if there's any information you'd like from a plasma-fails- to-load system with "functioning" X and/or Plasma accessible only via bizarre workarounds. But I may not have access to the computer next week... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1576500 Title: Plasma fails to load: "all shell packages missing" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/1576500/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs