Canonical Ubuntu engineers, in collaboration with community members, have compiled a list of library packages on the target server for the i386 Ubuntu 20.04 LTS release, which is now published at: https://code.launchpad.net/~ubuntu-core-dev/ubuntu-seeds/+git/i386.
Some packages will not be included in Ubuntu 20.04 LTS or will have a different name for the same library. These are such as gcc-8-base, libhogweed4, libnettle6, libperl5.28, libsensors4, libssl1.0.0, wine-stable-i386.
The following packages have been added to the targeting list:
- freeglut3
- gstreamer1.0-plugins-base
- libd3dadapter9-mesa
- libgpm2
- libosmesa6
- libtbb2
- libv4l-0
- libva-glx2
- va-driver-all
- vdpau-driver-all
For reference, here is a list of source packages that will continue to be compiled for the i386 architecture in Ubuntu 20.04 LTS so that i386 target packages can be installed.
https://people.canonical.com/~ubuntu-archive/germinate-output/i386.focal/i386+build-depends.sources