[Bug 1895360] Re: Terminal (and other default Ubuntu apps) won't launch due to missing libffi.so.7 in 20.10

[Steve Langasek]

You have a locally-installed python which is not compatible with the
libraries in Ubuntu 20.10.  This is not a bug in Ubuntu.

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Title:
  Terminal (and other default Ubuntu apps) won't launch due to missing
  libffi.so.7 in 20.10

Status in libffi package in Ubuntu:
  Invalid

Bug description:
  When I launch Terminal, I see the following error (st and urxvt are
  still launchable, as are Discord and Spotify, among others):

  Sep 11 18:22:39 arctic systemd[1918]: Started Application launched by gnome-shell.
  Sep 11 18:22:39 arctic gnome-shell[2191]: g_variant_unref: assertion 'value != NULL' failed
  Sep 11 18:22:39 arctic gnome-shell[2191]: g_variant_unref: assertion 'value != NULL' failed
  Sep 11 18:22:39 arctic gnome-shell[18808]: Traceback (most recent call last):
  Sep 11 18:22:39 arctic gnome-shell[18808]:   File "/usr/bin/gnome-terminal", line 9, in <module>
  Sep 11 18:22:39 arctic gnome-shell[18808]:     from gi.repository import GLib, Gio
  Sep 11 18:22:39 arctic gnome-shell[18808]:   File "/home/alichtman/.local/lib/python3.8/site-packages/gi/__init__.py", line 42, in <module>
  Sep 11 18:22:39 arctic gnome-shell[18808]:     from . import _gi
  Sep 11 18:22:39 arctic gnome-shell[18808]: ImportError: libffi.so.7: cannot open shared object file: No such file or directory

  And then Terminal never launches.

  libffi.so.8 is found in /usr/lib/x86_64-linux-gnu/, but libffi.so.7 is
  missing.

  $ lsb_release -rd
  Description:	Ubuntu Groovy Gorilla (development branch)
  Release:	20.10

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