UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.33 Safari/537.36

Steps to reproduce the problem:

$ chromium
[17378:17378:0708/073300.481028:ERROR:gl_implementation.cc(292)] Failed to load /usr/lib/chromium/libosmesa.so: /usr/lib/chromium/libosmesa.so: cannot open shared object file: No such file or directory
[17378:17378:0708/073300.504284:ERROR:viz_main_impl.cc(201)] Exiting GPU process due to errors during initialization
[17338:17510:0708/073301.143346:ERROR:object_proxy.cc(616)] Failed to call method: org.freedesktop.Notifications.GetCapabilities: object_path= /org/freedesktop/Notifications: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Notifications was not provided by any .service files
[17466:17466:0708/073301.352283:ERROR:gl_implementation.cc(292)] Failed to load /usr/lib/chromium/swiftshader/libGLESv2.so: /usr/lib/chromium/swiftshader/libGLESv2.so: cannot open shared object file: No such file or directory
[17466:17466:0708/073301.381805:ERROR:viz_main_impl.cc(201)] Exiting GPU process due to errors during initialization
[17338:17355:0708/073301.438972:ERROR:browser_gpu_channel_host_factory.cc(119)] Failed to launch GPU process.
[17338:17338:0708/073301.966823:ERROR:gpu_process_transport_factory.cc(1016)] Lost UI shared context.

What is the expected behavior?

What went wrong?
Package: chromium
Version: 68.0.3440.33-1

-- System Information:
Debian Release: buster/sid
  APT prefers experimental
  APT policy: (990, 'experimental'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.16.0-2-amd64 (SMP w/1 CPU core)
Locale: LANG=zh_TW.UTF-8, LC_CTYPE=zh_TW.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages chromium depends on:
ii  chromium-common      68.0.3440.33-1
ii  libasound2           1.1.6-1
ii  libatk-bridge2.0-0   2.26.2-1
ii  libatk1.0-0          2.28.1-1
ii  libatomic1           8.1.0-9
ii  libavcodec57         7:3.4.2-2+b2
ii  libavformat57        7:3.4.2-2+b2
ii  libavutil55          7:3.4.2-2+b2
ii  libc6                2.27-3
ii  libcairo-gobject2    1.15.10-3
ii  libcairo2            1.15.10-3
ii  libcups2             2.3~b5-1
ii  libdbus-1-3          1.13.4-3
ii  libdrm2              2.4.92-1
ii  libevent-2.1-6       2.1.8-stable-4
ii  libexpat1            2.2.5-3
ii  libflac8             1.3.2-3
ii  libfontconfig1       2.13.0-5
ii  libfreetype6         2.8.1-2
ii  libgcc1              1:8.1.0-9
ii  libgdk-pixbuf2.0-0   2.36.11-2
ii  libglib2.0-0         2.56.1-2
ii  libgtk-3-0           3.22.30-2
ii  libharfbuzz0b        1.8.2-2
ii  libicu60             60.2-6
ii  libjpeg62-turbo      1:1.5.2-2+b1
ii  liblcms2-2           2.9-2
ii  libminizip1          1.1-8+b1
ii  libnspr4             2:4.19-3
ii  libnss3              2:3.38-1
ii  libopenjp2-7         2.3.0-1
ii  libopus0             1.3~beta+20180518-1
ii  libpango-1.0-0       1.42.1-2
ii  libpangocairo-1.0-0  1.42.1-2
ii  libpci3              1:3.5.2-1
ii  libpng16-16          1.6.34-1
ii  libpulse0            12.0-1
ii  libre2-4             20180301+dfsg-1
ii  libsnappy1v5         1.1.7-1
ii  libstdc++6           8.1.0-9
ii  libvpx5              1.7.0-3
ii  libwebp6             0.6.1-2
ii  libwebpdemux2        0.6.1-2
ii  libwebpmux3          0.6.1-2
ii  libx11-6             2:1.6.5-1
ii  libx11-xcb1          2:1.6.5-1
ii  libxcb1              1.13-1
ii  libxcomposite1       1:0.4.4-2
ii  libxcursor1          1:1.1.15-1
ii  libxdamage1          1:1.1.4-3
ii  libxext6             2:1.3.3-1+b2
ii  libxfixes3           1:5.0.3-1
ii  libxi6               2:1.7.9-1
ii  libxml2              2.9.7+dfsg-1
ii  libxrandr2           2:1.5.1-1
ii  libxrender1          1:0.9.10-1
ii  libxslt1.1           1.1.32-2
ii  libxss1              1:1.2.2-1+b2
ii  libxtst6             2:1.2.3-1
ii  zlib1g               1:1.2.11.dfsg-1

chromium recommends no packages.

Versions of packages chromium suggests:
pn  chromium-driver  <none>
pn  chromium-l10n    <none>
pn  chromium-shell   <none>

-- no debconf information

Did this work before? N/A 

Chrome version: 68.0.3440.33  Channel: n/a
OS Version: 
Flash Version: 

I have this problem on one of my machines.
ls -og /usr/lib/chromium/
-rwsr-xr-x 1     18768 06-30 04:48 chrome-sandbox
-rw-r--r-- 1    816254 06-30 04:48 chrome_100_percent.pak
-rw-r--r-- 1   1065153 06-30 04:48 chrome_200_percent.pak
-rwxr-xr-x 1 125837672 06-30 04:48 chromium
-rw-r--r-- 1   1392368 06-30 04:48 keyboard_resources.pak
drwxr-xr-x 2      4096 07-08 07:08 locales
-rw-r--r-- 1    177322 06-30 04:48 natives_blob.bin
-rw-r--r-- 1  13565961 06-30 04:48 resources.pak
-rw-r--r-- 1   1407312 06-30 04:48 snapshot_blob.bin
-rw-r--r-- 1   1800996 06-30 04:48 v8_context_snapshot.bin