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I have been using caldav calendars in thunderbird for quite some time, but since the upgrade to Kubuntu 22.04 I can't get it to work any more, while on another machine still running 20.04 the same works without problems. Just now I upgraded the 22.04 machine to 22.10 but no difference.

When I enter user and URL and press Find Calendars nothing is found and all I can see in the logs is this:

console.warn: Calendar: [CalICSProvider] Could not detect calendar using method attemptHead
console.warn: Calendar: [CalICSProvider] Could not detect calendar using method attemptGet
console.warn: Calendar: [CalICSProvider] Could not detect calendar using method attemptDAVLocation
console.warn: Calendar: [CalICSProvider] Could not detect calendar using method attemptPut
console.warn: Calendar: [CalDavProvider] Could not detect calendar using method attemptLocation
console.warn: Calendar: [CalDavProvider] Could not detect calendar using method wellKnown
console.warn: Calendar: [CalDavProvider] Could not detect calendar using method attemptRoot
console.error: Calendar: 
Error during calendar detection: resource:///modules/calendar/utils/calProviderDetectionUtils.jsm:20: NoneFoundError
DetectionError@resource:///modules/calendar/utils/calProviderDetectionUtils.jsm:20:1
@resource:///modules/calendar/utils/calProviderDetectionUtils.jsm:31:7
detect@resource:///modules/calendar/utils/calProviderDetectionUtils.jsm:164:26

At the same time when this stopped working, also handlers.json was broken, which just now I fixed by removing that file and starting from a default generated version. Given that both features relate to accessing some https url I just thought there might be a connection.

Any ideas where I should be looking?

Stephan Herrmann
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2 Answers2

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It turned out there was indeed a common cause:

While previously struggling with a problem that looked like https://superuser.com/questions/1122787/clicking-a-https-link-in-thunderbird-does-not-open-the-link-in-the-browser (in my case the update to kubuntu 22.04 had caused thunderbird to completely stop opening links in firefox), I had fiddled with preferences like network.protocol-handler.external-default. After removing that and similar preferences from prefs.js now, things are back to normal: I can connect to calendars on the net and links in mails open in my default browser.

I can only guess that the effect of those preferences has changed since the answers in an around that other thread.

Stephan Herrmann
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In my case the problem was an inadvertently enabled HTTP proxy.

Joril
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