This is a safety check added in python-apt to prevent old package
objects being reused in new (dep)caches. since the cache operates on
package ids, and the package ids might change, there are three things
that can happen:

(1) If # of packages in new cache < # in old cache: SEGV
(2) If id changed, functions called on the package might operate on a different 
package
(3) If you are lucky, everything works

** Changed in: apt (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1767875

Title:
  /usr/bin/update-
  
manager:ValueError:restart_icon_renderer_data_func:pkg_requires_restart:__get_candidate

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