This is a deprecated step for new installed Jitsi Meet
This step valid for only old Jitsi Meet server. The below step we already apply on installation time.
The first step to you need to back up of below file before updating the prosody
/etc/prosody/prosody.cfg.lua
After a backup of the above file, you need to update prosody using the below command for more info here
echo deb http://packages.prosody.im/debian $(lsb_release -sc) main | sudo tee -a /etc/apt/sources.list
wget https://prosody.im/files/prosody-debian-packages.key -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install prosody
After installing you need to replace backup file (/etc/prosody/prosody.cfg.lua) to same location
Also, you need to change the permission of /etc/prosody/certs folder with the below command
chmod -R 777 /etc/prosody/certs
After that, you need to edit /etc/prosody/conf.avail/your-domain.com.cfg.lua file name is different
You need to find an option and change it to storage = "memory"
in the above file and save it
After that, you need to reboot the server or reload services.