The git repo have no LFS enabled, but I was prepared git to use in another clone, so use the git config --global credential.helper that seems the cause of the problem.
Seems the same problem here, but I am using updated git (v2.17.0), so it is not a version problem.
Exemple: after simple git pull the message is
/usr/share/doc/git/contrib/credential/libsecret/git-credential-libsecret get: 1:
/usr/share/doc/git/contrib/credential/libsecret/git-credential-libsecret get:
/usr/share/doc/git/contrib/credential/libsecret/git-credential-libsecret:
not found
NOTES
There are no git-credential-libsecret file,
sudo ls /usr/share/doc/git/contrib/credential/libsecret/git-credential-libsecret
ls: cannot access '/usr/share/doc/git/contrib/credential/libsecret/git-credential-libsecret': No such file or directory