I don't get any error output here. Do you have any mention of x86_64 -linux-gnu in /etc/ld.so.conf or in any other snippets in /etc/ld.so.conf.d?
(xenial-amd64)root@nosferatu:~# dpkg -S /etc/ld.so.conf.d/x86_64-linux-gnu.conf libc6:amd64: /etc/ld.so.conf.d/x86_64-linux-gnu.conf (xenial-amd64)root@nosferatu:~# cat /etc/ld.so.conf.d/x86_64-linux-gnu.conf # Multiarch support /lib/x86_64-linux-gnu /usr/lib/x86_64-linux-gnu (xenial-amd64)root@nosferatu:~# ldconfig (xenial-amd64)root@nosferatu:~# ldconfig.real (xenial-amd64)root@nosferatu:~# ** Changed in: glibc (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1790020 Title: /sbin/ldconfig.real: Path `/lib/x86_64-linux-gnu' given more than once To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1790020/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs