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Re: apt{-cache,-get,itude} show wrong version of package after update

> Try running:
> sudo apt-get update # one more time, to be sure
> # then
> apt-cache policy ntp
> and see what version it refers to.

Thanks for the suggestions folks but there's not much to see
there, no packages are pinned.

I've made some progress, though. A closer look at the output
reveals that "Packages" is "Ign:", which is apparently [1]
apt-get's way of saying "I was unable to download it but that's
not a problem".

  # apt-get update
  Ign:1 http://mymirror/debian stretch InRelease
  Get:3 http://mymirror/debian stretch Release [118 kB]
  Get:4 http://mymirror/debian stretch Release.gpg [2434 B]
  Ign:5 http://mymirror/debian stretch/main amd64 Packages

strace tells me that apt-get uses the cached version in
/var/lib/apt/lists/, which may be why it thinks that not being
able to download it is not a problem.

Unfortunately, the Packages file in /var/lib/apt/lists/ is out
of date by months because it pertains to 9.2 while the mirror
has 9.4. Diffing the two shows why apt-get looks for the wrong
version of ntp :

 Package: ntp
-Version: 1:4.2.8p10+dfsg-3+deb9u1
+Version: 1:4.2.8p10+dfsg-3+deb9u2
 Installed-Size: 1804

What I'd like to know now is : what prevents apt-get from
downloading the Packages file from the mirror ? Wget can !

[1] https://superuser.com/questions/454867/