Following up with a tested source debdiff, in case it saves you the work. I cherry-picked the upstream fix onto trixie's 2.8.1-5:
https://github.com/networkupstools/nut/pull/2169 https://github.com/networkupstools/nut/issues/2168 It applies cleanly on top of the ten existing Debian patches, and builds cleanly in a clean trixie container. Source debdiff attached -- three files only: d/changelog, d/patches/series, and the new DEP-3 patch (upsmon-clear-CAL-flag.patch). NEWS.adoc and docs/nut.dict hunks from the upstream PR are dropped, as they don't apply to 2.8.1 and aren't functional. Verified at the binary level, /usr/lib/nut/upsmon: 2.8.1-5 +deb13u1 "calibration in progress" 1 1 "calibration finished" 0 1 NOTCAL 0 1 The stock trixie binary has no mechanism to report or clear that state at all, which matches the observed symptom exactly. The rebuild is installed and running on the affected host, with upsmon reconnected to the UPS. Thankyou.
nut_2.8.1-5+deb13u1.debdiff
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