Public bug reported:

When launching the Slack desktop app it crashes out with "GPU process
isn't usable. Goodbye.". It was running, but following this morning's
update it now fails. I've been on holiday so the updates I did this
morning bring in all the updates published last week. The full
diagnostic output is:

ubuntu  21.10
kernel  5.13.16-xanmod1
slack-desktop  4.19.2

> slack
Initializing local storage instance
(electron) Sending uncompressed crash reports is deprecated and will be removed 
in a future version of Electron. Set { compress: true } to opt-in to the new 
behavior. Crash reports will be uploaded gzipped, which most crash reporting 
servers support.
[09/13/21, 16:53:10:821] info:
╔════════════════════════════════════════════════════════╗
║ Slack 4.19.2, linux 5.13.0-14-generic on x64 ║
╚════════════════════════════════════════════════════════╝
[09/13/21, 16:53:10:821] info: Configured logger via
{
  "enableConsoleTransport": true,
  "identifierOverride": "webapp-service-worker-console",
  "shouldUseNewBackend": false,
  "loggerInstanceCount": 2
}
[09/13/21, 16:53:10:822] info: Predefined values for process
{
  "NODE_ENV": "production",
  "platform": "linux",
  "type": "browser",
  "timeZone": "Europe/London",
  "PACKAGE_MANIFEST.productName": "Slack",
  "PACKAGE_MANIFEST.version": "4.19.2",
  "PACKAGE_MANIFEST.commit": "b92697c",
  "PACKAGE_MANIFEST.branch": "HEAD"
}
[90432:0913/165311.095517:FATAL:gpu_data_manager_impl_private.cc(415)] GPU 
process isn't usable. Goodbye.
Trace/breakpoint trap (core dumped)

dmesg shows:
[ 1242.825885] traps: Chrome_IOThread[82546] trap int3 ip:55698668edd3 
sp:7f712e20a000 error:0 in slack[556983af0000+6463000]
[ 1437.727970] traps: Chrome_IOThread[90446] trap int3 ip:55cf9ce0cdd3 
sp:7fc274063000 error:0 in slack[55cf9a26e000+6463000]
[ 2202.345723] traps: Chrome_IOThread[122926] trap int3 ip:56483562fdd3 
sp:7fc49bd6d000 error:0 in slack[564832a91000+6463000]

apport.log:
apport.log:ERROR: apport (pid 5229) Mon Sep 13 11:09:05 2021: apport: report 
/var/crash/_usr_lib_slack_slack.1000.crash already exists and unseen, doing 
nothing to avoid disk usage DoS
apport.log:ERROR: apport (pid 5231) Mon Sep 13 11:09:05 2021: executable: 
/usr/lib/slack/slack (command line "/usr/lib/slack/slack\ --type=gpu-process\ 
--field-trial-handle=776489443531054611,11118674904772079488,13
1072\ 
--disable-features=AllowAggressiveThrottlingWithWebSocket,CalculateNativeWinOcclusion,CookiesWithoutSameSiteMustBeSecure,HardwareMediaKeyHandling,IntensiveWakeUpThrottling,RequestInitiatorSiteLockEnfocement,Sa
meSiteByDefaultCookies,SpareRendererForSitePerProcess,WebRtcHideLocalIpsWithMdns,WinRetrieveSuggestionsOnlyOnDemand\
 --enable-crash-reporter=66471e54-d0df-495a-9c87-fad66f3343c2,no_channel\ 
--global-crash-keys=66471
e54-d0df-495a-9c87-fad66f3343c2,no_channel,_productName=Slack,_version=4.19.2\ 
--gpu-preferences=UAAAAAAAAAAgAAAQAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgAAAAAAAAACAAAAAAAAAAAAAAAAAAAAAIAAAAAAAAAA
gAAAAAAAAACAAAAAAAAAA=\ --shared-files")

** Affects: slack (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1943568

Title:
  slack-desktop no longer runs

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