Good catch. It seems that sometime after I wrote this email a new signature was generated that is no longer generating errors so I guess it was a temporary issue.
-T > On Aug 2, 2018, at 7:28 PM, Ansgar Burchardt <ans...@debian.org> wrote: > > ADD6B7E2 is an encryption subkey. As this is not used, it was revoked > later (in 2014). > > Newer archive signing keys no longer have an encryption subkey > generated. > > Ansgar