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Why Ubuntu is calling Canonical?
(feddit.nl)
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
much thanks to @gary_host_laptop for the logo design :)
It may be the basic ubuntu telemetry (relatively non-invasive, but still a concern for the privacy-minded) sent by this tool unless you opted out at install:
https://github.com/ubuntu/ubuntu-report
from that page:
So it would not surprise me if it was scheduled to send, failed, and then re-triggered upon activation of a new network connection (the VPN).
Edit: Or even more likely, it is a connection from networkmanager to connectivity-check.ubuntu.com
https://ubuntu.com/core/docs/networkmanager/snap-configuration/connectivity-check