Since some update of Jitsi-Meet, the actual package has been removed and my instance stopped working. After some investigation I found out that the package is not installed anymore and has been removed.
When trying to reinstall it I encountered the following error:
The following packages have unmet dependencies:
jitsi-meet : Depends: jitsi-meet-prosody (= 1.0.6600-1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages."
The issue can be solved by updating prosody to version 12. After that I could install the jitsi-meet package seamlessly.
wget https://prosody.im/files/prosody-debian-packages.key -O /tmp/prosody.gpg.key
cat /tmp/prosody.gpg.key | gpg --dearmor >/usr/share/keyrings/prosody-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/prosody-keyring.gpg] http://packages.prosody.im/debian oldstable main" >/etc/apt/sources.list.d/prosody.list
apt-get install lua5.2
apt-get install prosody
Step 7: Check installed version
dpkg -l | grep prosody
You should find the following line:
ii prosody 0.12.1-1~buster1 amd64 Lightweight Jabber/XMPP server
0.12 indicates that version 12 is now installed. Now you can run the installation from the Jitsi documentation (apt install jitsi-meet).