Ubuntu 18.04 interface freeze - how to raise/report a bug

Asked by Nikolay Kirilov on 2019-02-06

I'm using Ubuntu 18.04 (bionic) GNOME 3.28.2 .15.0-45-generic
Since some updates in the last 2 weeks the interface started to freeze for 15-20 seconds and then reloads (like a crash of the UI, then it got killed by the OS, and then restarted).

The computer is unusable for 15-20 seconds then it works as nothing happened (I got proper sound and I believe everything is working - I just don't see it and I can not interact).

I updated again and again (with the hope it's something terrible that affected a lot of users and is already fixed, but looks it's not).

I started observing the problem more closely:
The logs app that comes with Ubuntu shows this error (under System section) at similar times the interface crashes:

gnome-shell[22505]: segfault at 28 ip 00007f9a80434fe0 sp 00007ffd7fb8b058 error 4 in libmutter-2.so.0.0.0[7f9a803b1000+157000]

gnome-shell[3366]: segfault at 28 ip 00007ffa74598fe0 sp 00007ffc912713c8 error 4 in libmutter-2.so.0.0.0[7ffa74515000+157000]

The problem appears in most cases when I'm on a video call using Slack or Zoom, so probably be related to that (not sure is it limited to that actually - may be it happened even when I was not on a call).
I heavily use multiple desktops and switch between them very often (on a single TFT display).

I'll be glad if anyone has an idea how to resolve this or report it (without reinstalling, which actually may be faster and easier).


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Launchpad Janitor (janitor) said : #1

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