我需要降级 pipewire，由于某种原因ppa-purge找不到 PPA，我按照说明操作在这个 repo 中安装管道和电线工。
$ 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
编辑：我的问题被标记为重复这个。我不确定这有什么关系，我需要降级软件包而不是删除 repo！
答案1
我认为您需要添加存储库服务器：
$ sudo ppa-purge -s ppa.launchpad.net ppa:pipewire-debian/pipewire-upstream
（我不知道为什么，但默认是 ppa.launchpadcontent.net）