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4d1350f
(Get the code!)
Thanks for the bug report. I suppose it's possible all these issues are related, but we shouldn't assume they are so quickly...
The Vulkan error message is being tracked in bug 2038313. As for Nextcloud, Vivaldi and Slack, they are all Chromium-based (or Electron which uses Chromium). So it's possible that Chromium's Wayland backend is a common point of failure. Although the error message itself is definitely coming from Mesa.
Since the only relevant Ubuntu package I can see is already tracked in bug 2038313 I will mark this as a duplicate of that, but you should also log bugs against each of the affected apps in their respective trackers.