Comment 23 for bug 1905322

Let me give the exact steps once more.

You can get similar results with a different OS, like LMDE, but we'll stick with Lubuntu for this one.

Boot to the newest beta version of Lubuntu. You can do this on bare metal, or you can do it in a VM. Wait for the desktop to load.

Open the menu in the lower left.
Click on Office.
Click on LibreOffice.
Open the menu in the lower left.
Click on Office.
Open LibreOffice Calc.
Open the menu in the lower left.
Click on LibreOffice Draw.

Keep doing that for all of them - going down the list of LibreOffice apps in order.

NOTE: The last two (Math and Writer) will NOT show on the screen. You'll still have Impress as the focused screen.

In Impress, it will first offer you a tip of the day, just click okay. Then, it will have a screen asking you if you want to select a template. Scroll down, in that template selection window, and select "Vivid."

If you've done everything correctly, it will crash - as seen in the video and as verified by at least one other user. You can trigger it on 20.10 on DistroTest.net. In LMDE the behavior is different - it crashes and freezes all the LibreOffice apps, requiring a killall from the terminal to close each of them.

I can't think of a way to describe it more clearly.