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

[Julian Andres Klode]

So, 1.5.1 is from artful (and that's EOL), and 1.2.29 is from xenial.
Partial upgrades are not supported. I suggest you find some help
returning your system to xenial, such as forums, mailing lists, or IRC.

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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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