In December 2025, Canonical announced a plan to
develop a universal Public Key Infrastructure called upki. Jon Seager has
published
an update about the project with instructions on trying it
out.

In the few weeks since we announced upki, the core revocation engine
has been established and is now functional, the CRLite mirroring tool
is working and a production deployment in Canonical's datacentres is
ongoing. We're now preparing for an alpha release and remain on track
for an opt-in preview for Ubuntu 26.04 LTS.

https://lwn.net/Articles/1059184/
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