I can also confirm that the default ANGLE renderer does work for Google
Chrome packaged as a deb when run in headless mode, whereas it doesn't
for the chromium snap.

I'm not sure why that is, but the following log is certainly relevant:

[0204/112747.679225:ERROR:angle_platform_impl.cc(44)] Display.cpp:940 
(initialize): ANGLE Display::initialize error 0: Internal Vulkan error (-3): 
Initialization of an object could not be completed for implementation-specific 
reasons, in 
../../third_party/angle/src/libANGLE/renderer/vulkan/RendererVk.cpp, 
initialize:1092.
[0204/112747.679325:ERROR:gl_surface_egl.cc(808)] EGL Driver message (Critical) 
eglInitialize: Internal Vulkan error (-3): Initialization of an object could 
not be completed for implementation-specific reasons, in 
../../third_party/angle/src/libANGLE/renderer/vulkan/RendererVk.cpp, 
initialize:1092.
[0204/112747.679364:ERROR:gl_surface_egl.cc(1430)] eglInitialize SwANGLE failed 
with error EGL_NOT_INITIALIZED
[0204/112747.679402:ERROR:gl_ozone_egl.cc(20)] GLSurfaceEGL::InitializeOneOff 
failed.
[0204/112747.680198:ERROR:viz_main_impl.cc(188)] Exiting GPU process due to 
errors during initialization


** Summary changed:

- WebGL broken in headless mode
+ [snap] Default ANGLE renderer doesn't work in headless mode

** Changed in: chromium-browser (Ubuntu)
       Status: Incomplete => Confirmed

** Changed in: chromium-browser (Ubuntu)
   Importance: Undecided => Medium

** Tags added: snap

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https://bugs.launchpad.net/bugs/1959416

Title:
  [snap] Default ANGLE renderer doesn't work in headless mode

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