I need to downgrade pipewire, for some reason ppa-purge
could not find the PPA, I've followed the instructions in this repo to install both pipewire and wireplumber.
$ file /etc/apt/sources.list.d/pipewire-debian-ubuntu-*
/etc/apt/sources.list.d/pipewire-debian-ubuntu-pipewire-upstream-focal.list: ASCII text
/etc/apt/sources.list.d/pipewire-debian-ubuntu-pipewire-upstream-focal.list.save: ASCII text
/etc/apt/sources.list.d/pipewire-debian-ubuntu-wireplumber-upstream-focal.list: ASCII text
/etc/apt/sources.list.d/pipewire-debian-ubuntu-wireplumber-upstream-focal.list.save: ASCII text
$ cat /etc/apt/sources.list.d/pipewire-debian-ubuntu-pipewire-upstream-focal.list
deb http://ppa.launchpad.net/pipewire-debian/pipewire-upstream/ubuntu focal main
# deb-src http://ppa.launchpad.net/pipewire-debian/pipewire-upstream/ubuntu focal main
$ sudo ppa-purge ppa:pipewire-debian/pipewire-upstream
Updating packages lists
PPA to be removed: pipewire-debian pipewire-upstream
Warning: Could not find package list for PPA: pipewire-debian pipewire-upstream
EDIT: my question was marked as duplicated of this one. I'm not sure how is this related, I need to downgrade a package not remove the repo!