Webbrowser-app crashes and freezes Ubuntu, then closes itself

Using Ubuntu 16.04 LTS.

At command line:

~$ uname -a
Linux sala-MS-7788 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

~$ lsb_release -rd
Description: Ubuntu 16.04.6 LTS
Release: 16.04

~$ webbrowser-app

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: Version 4 or later of flush extension not found
libGL error: failed to load driver: i915
libGL error: MESA-LOADER: failed to retrieve device information
unity::action::ActionManager::ActionManager(QObject*):
 Could not determine application identifier. HUD will not work properly.
 Provide your application identifier in $APP_ID environment variable.
UCUriHandler: Empty "APP_ID" environment variable, ignoring.
file:///usr/share/webbrowser-app/webbrowser/ContentPickerDialog.qml:22:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/webbrowser/ContentDownloadDialog.qml:22:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/ContentHandler.qml:20:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/webbrowser/DownloadHandler.qml:20:1: module "Ubuntu.DownloadManager" is not installed

(webbrowser-app:28854): IBUS-WARNING **: Unable to connect to ibus: Não foi possível conectar: Permissão negada
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: Version 4 or later of flush extension not found
libGL error: failed to load driver: i915
libGL error: MESA-LOADER: failed to retrieve device information

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.
shm_open() failed: Permissão negada

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.
[0802/152335.217740:ERROR:child_thread_impl.cc(762)] Request for unknown Channel-associated interface: ui::mojom::GpuMain
TouchSelectionController::active is deprecated, use TouchSelectionController::status instead
qml: Loaded 8 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-mobile.js
OxideQQuickWebView: canGoForward is deprecated. Please use the API provided by OxideQQuickNavigationHistory instead
OxideQQuickWebView: canGoBack is deprecated. Please use the API provided by OxideQQuickNavigationHistory instead
file:///usr/share/webbrowser-app/Downloader.qml:22:1: module "Ubuntu.DownloadManager" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:23:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:22:1: module "Ubuntu.DownloadManager" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:23:1: module "Ubuntu.Content" is not installed
Input device added: "Power Button" "/dev/input/event1" QFlags(0x1)
Input device added: "Video Bus" "/dev/input/event4" QFlags(0x1)
Input device added: "Power Button" "/dev/input/event0" QFlags(0x1)
Input device added: "HDA Intel PCH Line Out" "/dev/input/event8" QFlags(0x20)
Input device added: "HDA Intel PCH Front Headphone" "/dev/input/event9" QFlags(0x20)
Input device added: "HDA Intel PCH Front Mic" "/dev/input/event5" QFlags(0x20)
Input device added: "HDA Intel PCH Rear Mic" "/dev/input/event6" QFlags(0x20)
Input device added: "HDA Intel PCH Line" "/dev/input/event7" QFlags(0x20)
Input device added: "USB Optical Mouse" "/dev/input/event3" QFlags(0x2)
Input device added: "AT Translated Set 2 keyboard" "/dev/input/event2" QFlags(0x1|0x10)
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader

(webbrowser-app:28854): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permissão negada. dconf will not work properly.
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
qml: Loaded 8 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-desktop.js
[PERFORMANCE]: Last frame took 15881 ms to render.
intel_do_flush_locked failed: Erro de entrada/saída
[0802/152416.149967:FATAL:oxide_browser_process_main.cc(472)] Check failed: state_ == STATE_NOT_STARTED || state_ == STATE_SHUTDOWN. BrowserProcessMain::Shutdown() should be called before process exit
#0 0x7fe5835dc63e <unknown>
#1 0x7fe5835f637e <unknown>
#2 0x7fe584c17579 <unknown>
#3 0x7fe5bc84fff8 <unknown>
#4 0x7fe5bc850045 exit
#5 0x7fe5a6111f8e <unknown>
#6 0x7fe5a61150c5 <unknown>
#7 0x7fe5bb05f60a <unknown>
#8 0x7fe5bb05f9dc <unknown>
#9 0x7fe5bf369342 <unknown>
#10 0x7fe5bdea82d6 QOpenGLContext::swapBuffers()
#11 0x7fe5be85a50e <unknown>
#12 0x7fe5be85b2a1 <unknown>
#13 0x7fe5bec1f05c QApplicationPrivate::notify_helper()
#14 0x7fe5bec24516 QApplication::notify()
#15 0x7fe5bd70738b QCoreApplication::notifyInternal()
#16 0x7fe5bd75c5ed QTimerInfoList::activateTimers()
#17 0x7fe5bd75caf1 <unknown>
#18 0x7fe5bc0df197 g_main_context_dispatch
#19 0x7fe5bc0df3f0 <unknown>
#20 0x7fe5bc0df49c g_main_context_iteration
#21 0x7fe5bd75d7cf QEventDispatcherGlib::processEvents()
#22 0x7fe5bd704b4a QEventLoop::exec()
#23 0x7fe5bd70cbec QCoreApplication::exec()
#24 0x55bdd71fee16 (/usr/bin/webbrowser-app+0x55bdd71fee15)
#25 0x55bdd71f3a05 (/usr/bin/webbrowser-app+0x55bdd71f3a04)
#26 0x7fe5bc836830 __libc_start_main
#27 0x55bdd71f3b69 (/usr/bin/webbrowser-app+0x55bdd71f3b68)

Abortado (imagem do núcleo gravada)

As root:

~$ sudo webbrowser-app
[sudo] senha para rogeriowolff:
No protocol specified
QXcbConnection: Could not connect to display :0
Abortado (imagem do núcleo gravada)
---

~$ apport-collect 1838813

ApportVersion: 2.20.1-0ubuntu2.19
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2017-09-14 (690 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
Package: webbrowser-app 0.23+16.04.20161028-0ubuntu2
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.15.0-55.60~16.04.2-generic 4.15.18
Tags: xenial
Uname: Linux 4.15.0-55-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm lpadmin sambashare sudo
_MarkForUpload: True

---

~$ apt policy liboxideqtcore0 libgl1-mesa-dri

liboxideqtcore0:
  Instalado: 1.21.5-0ubuntu0.16.04.1
  Candidato: 1.21.5-0ubuntu0.16.04.1
  Tabela de versão:
 *** 1.21.5-0ubuntu0.16.04.1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1.13.6-0ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
libgl1-mesa-dri:
  Instalado: 18.0.5-0ubuntu0~16.04.1
  Candidato: 18.0.5-0ubuntu0~16.04.1
  Tabela de versão:
 *** 18.0.5-0ubuntu0~16.04.1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     11.2.0-1ubuntu2 500
        500 http://br.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
     8.0.4-0ubuntu0.6 500
        500 http://security.ubuntu.com/ubuntu precise-security/main amd64 Packages

-----

~$ dmesg

(...)

[109054.495124] audit: type=1400 audit(1565008265.755:37): apparmor="DENIED" operation="connect" profile="webbrowser-app" pid=4973 comm="webbrowser-app" family="unix" sock_type="stream" protocol=0 requested_mask="send receive connect" denied_mask="send connect" addr=none peer_addr="@/tmp/ibus/dbus-AiIRcAxL" peer="unconfined"
[109054.697343] audit: type=1400 audit(1565008265.955:38): apparmor="DENIED" operation="open" profile="webbrowser-app" name="/dev/dri/" pid=4973 comm="webbrowser-app" requested_mask="r" denied_mask="r" fsuid=1001 ouid=0
[109054.697362] audit: type=1400 audit(1565008265.955:39): apparmor="DENIED" operation="open" profile="webbrowser-app" name="/dev/dri/" pid=4973 comm="webbrowser-app" requested_mask="r" denied_mask="r" fsuid=1001 ouid=0
[109054.737144] audit: type=1400 audit(1565008265.995:40): apparmor="DENIED" operation="open" profile="webbrowser-app" name="/dev/dri/" pid=4973 comm="webbrowser-app" requested_mask="r" denied_mask="r" fsuid=1001 ouid=0
[109054.802257] audit: type=1400 audit(1565008266.059:41): apparmor="DENIED" operation="connect" profile="webbrowser-app" pid=4973 comm="pool" family="unix" sock_type="stream" protocol=0 requested_mask="send receive connect" denied_mask="send connect" addr=none peer_addr="@/tmp/ibus/dbus-AiIRcAxL" peer="unconfined"
[109057.616999] audit: type=1400 audit(1565008268.875:42): apparmor="DENIED" operation="open" profile="webbrowser-app" name="/sys/bus/" pid=4973 comm="webbrowser-app" requested_mask="r" denied_mask="r" fsuid=1001 ouid=0
[109065.828825] [drm] GPU HANG: ecode 6:0:0xc07fffff, in webbrowser-app [4973], reason: Hang on rcs0, action: reset
[109065.828893] i915 0000:00:02.0: Resetting chip after gpu hang
[109073.826416] i915 0000:00:02.0: Resetting chip after gpu hang
[109081.826444] i915 0000:00:02.0: Resetting chip after gpu hang
[109089.826419] i915 0000:00:02.0: Resetting chip after gpu hang
[109097.826436] i915 0000:00:02.0: Resetting chip after gpu hang
[110496.936965] perf: interrupt took too long (3968 > 3927), lowering kernel.perf_event_max_sample_rate to 50250
[114684.665258] perf: interrupt took too long (5064 > 4960), lowering kernel.perf_event_max_sample_rate to 39250
[117665.764736] r8169 0000:02:00.0 enp2s0: link down
[117668.671696] r8169 0000:02:00.0 enp2s0: link up