I have tried to disable Evolution Reminders and disable Calendar Reminders both in Settings, but to no avail. I have also tried changing the configuration file setting for Evolution to add the setting for ignoring reminders for GNOME - but to no avail. There seems to be no mention of this annoying issue in the 22.04 release of Ubuntu. This used to be working just fine (ie no reminders! I use Thunderbird and am very happy with its reminders) before 22.04 upgrade. Clearly something has changed but unfortunately I cannot find any clear tips/suggestions on the web on how to revert it back to no reminders now.
4 Answers
After searching for a solution for a looong time and going through lots of questions in askubuntu and trying their proposed solutions, nothing worked for me...
Until I read the answer above from Naveen and I was able to configure Evolution Alarm Notify to stop popping up those annoying reminders!!
I read the question Naveen mentioned above. I did not try the step that worked for Naveen, as it did not seem to make sense to me. BUT I first tried the answer that explains how to configure the setting notify-with-tray in org.gnome.evolution-data-server.calendar. I tested it and it seems to work for me (for now ) !!!
This is how the setting looks like after configuring it.

You can also configure it via the terminal
gsettings set org.gnome.evolution-data-server.calendar notify-with-tray true
In my case I had a reminder set in Gnome Calendar, possibly 5 years ago when I setup the system.
I had forgotten the app existed.
When I removed the activity from Gnome Calendar, it no longer bugged me about it every day.
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I was finally able to get rid of these reminders using tips from Turn off calendar notifications - Ubuntu 20.04
In particular the step: Copy the file /etc/xdg/autostart/org.gnome.Evolution-alarm-notify.desktop to your local .config/autostart folder.
is the one that made the difference. I had to make sure that the evolution notification daemon stops creating notifications for my GNOME desktop.
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Ubuntu 22.04 - I'm not sure yet but in thunderbird preferences (thunderbird > preferences > addons and themes > eds calendar integration) that looks like the culprit. I'll report back if if I'm wrong.
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