Summary
tlmgr update --self --all を実行したらエラー.GnuPGをインストールして解決.
% tlmgr update --self --all
tlmgr: package repository ftp://ftp.kddilabs.jp/CTAN/systems/texlive/tlnet (not verified: gnupg not available)
tlmgr: saving backups to /usr/local/texlive/2016/tlpkg/backups
% tlmgr update --self --all
tlmgr: package repository ftp://ftp.u-aizu.ac.jp/pub/tex/CTAN/systems/texlive/tlnet (not verified: gnupg not available)
tlmgr: saving backups to /usr/local/texlive/2016/tlpkg/backups
% tlmgr key list
gnupg is not found or not set up, cannot continue with action `key'
tlmgr: An error has occurred. See above messages. Exiting.% brew install gnupg2
% tlmgr key list
/usr/local/texlive/2016/tlpkg/gpg/pubring.gpg
---------------------------------------------
pub 2048R/06BAB6BC 2016-03-19
uid [ultimate] TeX Live Distribution <tex-live@tug.org>
sub 2048R/B001980F 2016-03-19
sub 2048R/19438C70 2016-03-19 [expires: 2017-09-10]
% tlmgr update --self --all
tlmgr: package repository ftp://ftp.u-aizu.ac.jp/pub/tex/CTAN/systems/texlive/tlnet (verified)
tlmgr: saving backups to /usr/local/texlive/2016/tlpkg/backups