[Bug 2146422] Re: Installer UI crashed with ServerDisconnectedError

[Valentin Haudiquet]

I just started the installer, it asked me about an update, I said yes,
it restarted and I see a crash (cf. screenshot). Selecting "Continue" to
restart the installer works.

** Attachment added: "Capture d’écran du 2026-03-26 16-04-12.png"
   https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2146422/+attachment/5956031/+files/Capture%20d%E2%80%99%C3%A9cran%20du%202026-03-26%2016-04-12.png

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Title:
  Installer UI crashed with ServerDisconnectedError

Status in subiquity package in Ubuntu:
  Incomplete

Bug description:
  I tried to install current resolute-live-server-riscv64.iso. subiquity
  26.04-beta+git12.e422d423 failed with the error below. Full logs
  appended.

  SnapUpdated: True 
  SourcePackage: subiquity
  Tags: subiquity
  Title: Installer UI crashed with ServerDisconnectedError
  Traceback:
   Traceback (most recent call last):
     File "/snap/subiquity/7156/lib/python3.12/site-packages/subiquity/client/client.py", line 426, in run
       await super().run()
     File "/snap/subiquity/7156/lib/python3.12/site-packages/subiquitycore/tui.py", line 390, in run
       await super().run()
     File "/snap/subiquity/7156/lib/python3.12/site-packages/subiquitycore/core.py", line 133, in run
       raise exc
     File "/snap/subiquity/7156/lib/python3.12/site-packages/subiquity/client/client.py", line 367, in start
       variant = await self.client.meta.client_variant.GET()
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7156/lib/python3.12/site-packages/subiquity/common/api/client.py", line 75, in impl 
       async with make_request(
     File "/snap/subiquity/7156/usr/lib/python3.12/contextlib.py", line 210, in __aenter__
       return await anext(self.gen)
              ^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7156/lib/python3.12/site-packages/subiquity/common/api/client.py", line 168, in make_request
       async with session.request(
     File "/snap/subiquity/7156/usr/lib/python3/dist-packages/aiohttp/client.py", line 1187, in __aenter__
       self._resp = await self._coro
                    ^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7156/usr/lib/python3/dist-packages/aiohttp/client.py", line 601, in _request
       await resp.start(conn)
     File "/snap/subiquity/7156/usr/lib/python3/dist-packages/aiohttp/client_reqrep.py", line 965, in start
       message, payload = await protocol.read()  # type: ignore[union-attr]
                          ^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/7156/usr/lib/python3/dist-packages/aiohttp/streams.py", line 622, in read 
       await self._waiter
   aiohttp.client_exceptions.ServerDisconnectedError: Server disconnected

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