E: Package 'gnupg' has no installation candidate
這個(gè)該怎么解決呢?
gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation在 Docker 中 Ubuntu 添加密鑰時(shí)遇到的錯(cuò)誤 Step 4/14 : RUN apt-key adv --keyserver keyserver.ubuntu.c...