gpg-agent cannot get started due to relocation error

[HongxuChen]

Running `gpg' related commands continues reporting:

gpg: can't connect to the agent: IPC connect call failed
gpg: error getting the KEK: No agent running

And results of `gpg-agent --daemon':

gpg-agent: relocation error: gpg-agent: symbol gcry_get_config version GCRYPT_1.6 not defined in file libgcrypt.so.20 with link time reference

Relevant packages that I have installed:
libgcrypt11:amd64 libgcrypt11-dev libgcrypt20:amd64 libgcrypt20-dev libgcrypt20:i386

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gpg-agent 2.2.4-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: LXQt
Date: Fri Jun 8 15:51:38 2018
InstallationDate: Installed on 2016-03-04 (825 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: gnupg2
UpgradeStatus: Upgraded to bionic on 2018-05-13 (25 days ago)

[Aleksander Machniak (al3c)]

Works for me, but....

I hit the same issue after upgrade and it was caused by another version (2.1.15) of gnupg installed from source on my system. After cleaning /usr/local from that version files it started working. So, maybe that's also the case for you.

[HongxuChen (hsxuif)]

Not my case. I haven't built any gnupg before and from results of `locate gnupg` and `find -name "*gnupg*"` there seem no relevant files. Indeed this issue occurred after I upgraded from 16.04 to 18.04.

[HongxuChen (hsxuif)]

Okay, I finally realized that it was my self-built libgcrypt that causes the issue.