installation fails in the presence of foreign packages

[Thiago Jung Bauermann]

I tried upgrading the Ubuntu Desktop 23.10 installation on my amd64 laptop to 24.04, but it failed with the following error (I'll attach a more complete installation log):

```
Errors were encountered while processing:
 xdg-desktop-portal-gtk
 libgck-2-2:amd64
 libpython3.12-stdlib:amd64
 libpython3.12-stdlib:arm64
 libgcr-4-4:amd64
 libnma-gtk4-0:amd64
 network-manager-gnome
 python3.12
 libnma0:amd64
 spice-client-glib-usb-acl-helper
 yelp
 libyelp0:amd64
 libpython3.12-dev:amd64
 libpython3.12-dev:arm64
 zenity
 libpython3.12t64:amd64
 libpython3.12t64:arm64
 gir1.2-gcr-4:amd64
 mutter-common-bin
 gir1.2-gck-2:amd64
 at-spi2-core
 texlive-binaries
 perl-debug
 keyboard-configuration
 xdg-user-dirs-gtk
 libpython3-stdlib:amd64
 console-setup
 libpython3-dev:amd64
 libpython3-dev:arm64
 kbd
 console-setup-linux
 initramfs-tools
Traceback (most recent call last):
  File "/usr/lib/ubuntu-advantage/convert_list_to_deb822.py", line 12, in <module>
    from aptsources.sourceslist import SourceEntry # type: ignore
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/aptsources/__init__.py", line 3, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'
Traceback (most recent call last):
  File "/usr/lib/ubuntu-advantage/upgrade_lts_contract.py", line 10, in <module>
    from uaclient import http, upgrade_lts_contract
  File "/usr/lib/python3/dist-packages/uaclient/upgrade_lts_contract.py", line 30, in <module>
    from uaclient import contract, defaults, messages, system, util
  File "/usr/lib/python3/dist-packages/uaclient/contract.py", line 7, in <module>
    from uaclient import (
  File "/usr/lib/python3/dist-packages/uaclient/version.py", line 8, in <module>
    from uaclient.apt import (
  File "/usr/lib/python3/dist-packages/uaclient/apt.py", line 13, in <module>
    import apt_pkg # type: ignore
    ^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'apt_pkg'

Upgrade complete

The upgrade has completed but there were errors during the upgrade
process.
```

I created a btrfs snapshot before the upgrade so I reverted back to it, removed all i386, armhf and arm64 foreign architecture packages I had installed and tried again. This time the upgrade worked fine.

[Thiago Jung Bauermann (thiago-bauermann)]

This is the list of packages I had installed before the failed upgrade, including the foreign architecture ones.

[Chris Peterson (cpete)]

Hi and thanks for your report. Reassigning to u-r-u for upgrade issues.