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tried to execute: snap list subiquity
getting this crash message:

Installer shell session activated.

This shell session is running inside the installer environment.  You
will be returned to the installer when this shell is exited, for
example by typing Control-D or 'exit'.

Be aware that this is an ephemeral environment.  Changes to this
environment will not survive a reboot. If the install has started, the
installed system will be mounted at /target.
root@ubuntu-server:/# sudo snap refresh subiquity --channel=latest/candidate
subiquity (candidate) 21.06.01 from Canonical* refreshed
root@ubuntu-server:/# connecting...  
generating crash report
resetreport saved to /var/crash/1623907935.747623920.ui.crash
Traceback (most recent call last):
  File "/snap/subiquity/2495/usr/bin/subiquity", line 33, in <module>
    sys.exit(load_entry_point('subiquity==0.0.5', 'console_scripts', 'subiquity-tui')())
  File "/snap/subiquity/2495/lib/python3.6/site-packages/subiquity/cmd/tui.py", line 142, in main
    subiquity_interface.run()
  File "/snap/subiquity/2495/lib/python3.6/site-packages/subiquity/client/client.py", line 369, in run
    super().run()
  File "/snap/subiquity/2495/lib/python3.6/site-packages/subiquitycore/tui.py", line 374, in run
    super().run()
  File "/snap/subiquity/2495/lib/python3.6/site-packages/subiquitycore/core.py", line 128, in run
    raise exc
  File "/snap/subiquity/2495/usr/lib/python3.6/asyncio/events.py", line 145, in _run
    self._callback(*self._args)
  File "/snap/subiquity/2495/usr/lib/python3/dist-packages/urwid/raw_display.py", line 404, in <lambda>
    event_loop, callback, self.get_available_raw_input())
  File "/snap/subiquity/2495/usr/lib/python3/dist-packages/urwid/raw_display.py", line 436, in get_available_raw_input
    codes = self._get_gpm_codes() + self._get_keyboard_codes()
  File "/snap/subiquity/2495/usr/lib/python3/dist-packages/urwid/raw_display.py", line 510, in _get_keyboard_codes
    code = self._getch_nodelay()
  File "/snap/subiquity/2495/usr/lib/python3/dist-packages/urwid/raw_display.py", line 644, in _getch_nodelay
    return self._getch(0)
  File "/snap/subiquity/2495/usr/lib/python3/dist-packages/urwid/raw_display.py", line 554, in _getch
    return ord(os.read(self._term_input_file.fileno(), 1))
OSError: [Errno 5] Input/output error
Connection to hwe0006 closed.
fheimes@T570:~$

...
 2021-06-17 05:30:33,349 DEBUG subiquity.views.welcome:81 ('zh_CN.UTF-8', 'en_US
.UTF-8')
 2021-06-17 05:32:15,747 DEBUG subiquitycore.common.errorreport:384 generating crash report
 2021-06-17 05:32:15,748 INFO subiquitycore.common.errorreport:407 saving crash report 'Installer UI crashed with OSError' to /var/crash/1623907935.747623920.ui.crash
 2021-06-17 05:32:15,748 INFO subiquity/ErrorReporter/1623907935.747623920.ui/add_info:100 start:
InstallerLogInfo:
 2021-06-17 05:30:04,622 INFO subiquity:118 Starting Subiquity revision 2278
 2021-06-17 05:30:04,622 INFO subiquity:119 Arguments passed: ['/snap/subiquity/2278/usr/bin/subiquity']
 2021-06-17 05:30:04,634 INFO subiquity/Welcome:107 start: starting UI
 2021-06-17 05:30:33,317 INFO subiquity:118 Starting Subiquity revision 2495
 2021-06-17 05:30:33,317 INFO subiquity:119 Arguments passed: ['/snap/subiquity/2495/usr/bin/subiquity']
 2021-06-17 05:30:33,340 INFO subiquity/ErrorReporter/1623907826.463103533.serve:


root@ubuntu-server:/# snap list subiquity
Name       Version   Rev   Tracking         Publisher   Notes
subiquity  21.06.01  2495  latest/stable/…  canonical*  classic
root@ubuntu-server:/#