[Bug 1644643] Re: apt failed to run due to link time reference error

[MrMe01]

Julian, I get something similar, but different.
"# apt
apt: relocation error: /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0: symbol _ZN9pkgSystem9LockInnerEv, version APTPKG_5.0 not defined in file libapt-pkg.so.5.0 with link time reference"

apt-cache policy is the same, and so is apt libapt-pkg5.0.

What can I do to rectify this? I started asking on reddit, got
redirected to askubuntu, and someone pointed me to this page, I was the
one who confirmed it, as I experienced the same or similar issues.

I am contemplating reinstalling as using the same install media in a VM
(mini.iso) resulted in a working state, and apt functions as expected,
so I doubt the .deb files are the issue here, more likely the state of
apt on my box.

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https://bugs.launchpad.net/bugs/1644643

Title:
  apt failed to run due to link time reference error

Status in apt package in Ubuntu:
  Incomplete

Bug description:
  After update apt and its related library to 1.2.15 from 1.2.10ubuntu1,
  I get following message when I try to invoke apt:

  apt-get: relocation error: /usr/lib/x86_64-linux-gnu/libapt-
  private.so.0.0: symbol _ZlsRSoRKN3APT9PrettyPkgE, version APTPKG_5.0
  not defined in file libapt-pkg.so.5.0 with link time reference

  1.2.10 do not have this problem. Now I manually downgrade from 1.2.15
  to 1.2.10 to solve this problem.

  Ubuntu release: 
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04

  what I expect to happen: apt would show the helper message
  what happened instead: apt shows me the line on above

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