Thunderbird / Lightning no longer detecting caldav calendars (since Kubuntu 22.04)

Stephan Herrmann

12/8/23, 12:40 PM

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?

220

2 + 0

thunderbird

calendar

kubuntu

Score:0

Ubuntu

Joril

3/26/24, 10:42 AM

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

+ 0

Score:0

Ubuntu

Stephan Herrmann

12/18/23, 4:03 PM

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.

+ 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Thunderbird / Lightning no longer detecting caldav calendars (since Kubuntu 22.04)

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.