Lintian tag information: doubly-armored-upstream-signature (type: error)
Description (from lintian-explain-tags)
The packaging includes a detached upstream signature file that was armored twice (or more) using gpg --enarmor. That is an error. Please armor the signature just once. You can also use standard tools such as gpg --armor --detach-sig. Visibility: error Show-Always: no Check: upstream-signature