Derek Martin:
Ubuntu LTS has: libgpgme11/xenial,now 1.6.0-1 amd64 [installed]GPGME - GnuPG Made Easy (library) libgpgme11-dev/xenial 1.6.0-1 amd64 GPGME - GnuPG Made Easy (development files)
That's Ubuntu xenial (16.04 LTS). There is a new LTS version bionic (18.04 LTS), which ships with 1.10.0.
Also, your mail had the header "User-Agent: Mutt/1.5.21 (2010-09-15)", so it seems you are using a version of Mutt that's even older than the package shipped with your distro: https://packages.ubuntu.com/xenial/mutt
If Mutt changes the minimum GPGME requirement, you won't have problems if you use both Mutt and GPGME from a distribution. Only if you build a modern mutt with an antiqated GPGME - in which case, you can also build a modern GPGME.
-- ilf If you upload your address book to "the cloud", I don't want to be in it.
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