[Bug 1796037] Re: [QEMU] When loading partman step, GNOME Shell vanishes, no more decoration and installer UI frozen

[Iain Lane]

I was suspecting snapd because I saw "loop0", "unsquashfs" and "snapd"
spiking in top just before the VM went away, btw.

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Title:
  [QEMU] When loading partman step, GNOME Shell vanishes, no more
  decoration and installer UI frozen

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Following "Install (entire disk) in Ubuntu Desktop amd64 in Cosmic
  Daily" test case, on 20181003.1 desktop live image.

  Using Qemu (host is an up to date cosmic) and starting in ubiquity-only mode:
  - when clicking on continue on the <…> step, the UI is freezing for a minute, then GNOME Shell vanishes, no more decoration to ubiquity windows, black background (reproduced twice). See attached picture.
  - I was still able to proceed thus, but on the "who are you" page, no more control, the cursor is changing on text element to show the text cursor, but no caret.
  - no crash found in /var/crash, but the GNOME Shell process is marked as defunct.

  Can anyone reproduce it? I was able to reliably reproduce it on 3
  consecutive boots here.

  Note: there is also the fact that if I set focus to another window
  than qemu and going back to the qemu window, no way to type/click in
  ubiquity or live session. This may have an impact above on the cursor
  issue. Nevertheless, I have took great care to not change focus in the
  above use case.

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