也许造成此问题的原因是jitsi桌面（绝对不是jitsi-meet）具有未满足的依赖关系，而这些依赖关系无法轻易解决：
nicholas $
nicholas $ cat /etc/apt/sources.list.d/jitsi-stable.list
#deb https://download.jitsi.org stable/
nicholas $
nicholas $ cat /etc/apt/sources.list.d/jitsi-unstable.list
deb https://download.jitsi.org unstable/
nicholas $
nicholas $ sudo apt update
Hit:1 https://download.jitsi.org unstable/ InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://archive.canonical.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-security InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
210 packages can be upgraded. Run 'apt list --upgradable' to see them.
nicholas $
nicholas $ sudo apt -y install jitsi
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help resolve the situation:
The following packages have unmet dependencies:
jitsi : Depends: libavformat57 but it is not installable or
libavformat-ffmpeg56 but it is not installable
Depends: libavcodec57 but it is not installable or
libavcodec-extra57 but it is not installable or
libavcodec-ffmpeg56 but it is not installable or
libavcodec-ffmpeg-extra56 but it is not installable
Depends: libavfilter6 but it is not installable or
libavfilter-extra6 but it is not installable or
libavfilter-ffmpeg5 but it is not installable
Depends: libavutil55 but it is not installable or
libavutil-ffmpeg54 but it is not installable
Depends: libswscale4 but it is not installable or
libswscale-ffmpeg3 but it is not installable
E: Unable to correct problems, you have held broken packages.
nicholas $
再次，不是jitsi-meet但仅jitsi用于GUI 的安装SIP。