Public bug reported:

I am happily running Bionic 18.04 Kubuntu (all previous bugs resolved).
I decided to upgrade to Focal 20.04 and got a failure for an unsolvable
conflict. I discovered a ppa for xenial was the cause. I removed that
and then retried. (All my ppa were now for Bionic so it seemed safe)

sudo do-release-upgrade
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.

On "sudo apt update" I discovered that numerous pulseaudio applications
and dependencies were a problem:"The following packages have been kept
back:"

dad@dad314159:~$ sudo apt list -a --upgradable
Listing... Done
libpulse-dev/focal 1:13.99.1-1ubuntu3.7+kxstudio1 amd64 [upgradable from: 
1:11.1-1ubuntu7.11]
libpulse-dev/bionic-updates,bionic-security,now 1:11.1-1ubuntu7.11 amd64 
[installed,upgradable to: 1:13.99.1-1ubuntu3.7+kxstudio1]
libpulse-dev/bionic 1:11.1-1ubuntu7 amd64

libpulse-mainloop-glib0/focal 1:13.99.1-1ubuntu3.7+kxstudio1 amd64 [upgradable 
from: 1:11.1-1ubuntu7.11]
libpulse-mainloop-glib0/bionic-updates,bionic-security,now 1:11.1-1ubuntu7.11 
amd64 [installed,upgradable to: 1:13.99.1-1ubuntu3.7+kxstudio1]
libpulse-mainloop-glib0/bionic 1:11.1-1ubuntu7 amd64

libpulse0/focal 1:13.99.1-1ubuntu3.7+kxstudio1 amd64 [upgradable from: 
1:11.1-1ubuntu7.11]
libpulse0/bionic-updates,bionic-security,now 1:11.1-1ubuntu7.11 amd64 
[installed,upgradable to: 1:13.99.1-1ubuntu3.7+kxstudio1]
libpulse0/bionic 1:11.1-1ubuntu7 amd64

libpulsedsp/focal 1:13.99.1-1ubuntu3.7+kxstudio1 amd64 [upgradable from: 
1:11.1-1ubuntu7.11]
libpulsedsp/bionic-updates,bionic-security,now 1:11.1-1ubuntu7.11 amd64 
[installed,upgradable to: 1:13.99.1-1ubuntu3.7+kxstudio1]
libpulsedsp/bionic 1:11.1-1ubuntu7 amd64

pulseaudio/focal 1:13.99.1-1ubuntu3.7+kxstudio1 amd64 [upgradable from: 
1:11.1-1ubuntu7.11]
pulseaudio/bionic-updates,bionic-security,now 1:11.1-1ubuntu7.11 amd64 
[installed,upgradable to: 1:13.99.1-1ubuntu3.7+kxstudio1]
pulseaudio/bionic 1:11.1-1ubuntu7 amd64

pulseaudio-module-jack/focal 1:13.99.1-1ubuntu3.7+kxstudio1 amd64 [upgradable 
from: 1:11.1-1ubuntu7.11]
pulseaudio-module-jack/bionic-updates,bionic-security,now 1:11.1-1ubuntu7.11 
amd64 [installed,upgradable to: 1:13.99.1-1ubuntu3.7+kxstudio1]
pulseaudio-module-jack/bionic 1:11.1-1ubuntu7 amd64

pulseaudio-utils/focal 1:13.99.1-1ubuntu3.7+kxstudio1 amd64 [upgradable from: 
1:11.1-1ubuntu7.11]
pulseaudio-utils/bionic-updates,bionic-security,now 1:11.1-1ubuntu7.11 amd64 
[installed,upgradable to: 1:13.99.1-1ubuntu3.7+kxstudio1]
pulseaudio-utils/bionic 1:11.1-1ubuntu7 amd64

As is visible, I am not able to upgrade to Focal elements because I am
running Bionic and I cannot upgrade Focal elements because the current
upgrade tree uses Bionic ppa. If I were to put Focal ppa in my
/etc/apt/sources.list there would likely be havoc!

pulseaudio currently does not work so I am using alsa. I do not know haw
many other Focal elements will emerge even if I can resolve these,
Additionally, I do not know how to fix these anyhow.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1917283

Title:
  "The following packages have been kept back:" bionic requesting focal
  downloads

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