Manually update a library? And a GetDeb question?

John Hupp lubuntu at
Sat Feb 9 21:38:06 UTC 2013

On 2/9/2013 4:19 PM, Jonathan Marsden wrote:
> On 02/09/2013 07:45 AM, John Hupp wrote:
>> Regarding my last question below, I now see that Synaptic uses dpkg,
>> so it seems very likely that despite the language of some of the
>> documentation, there is probably only one package database shared by
>> all the relevant tools.  Enlighten me if that's incorrect.
> Both /var/lib/dpkg/ and /var/cache/apt/ exist on my systems, and both
> contain data about packages.  So in that general sense, I suspect you
> are incorrect.
> However, in practice, it may be that apt keeps additional information
> (possibly about dependencies and why certain packages were installed)
> that dpkg does not, in which case you can use both dpkg and apt to do
> package management on the same PC with no problem.  This is my personal
> experience, at least.
> My best guess, therefore, is that apt uses the dpkg data about packages,
> but maintains some additional info for commands and capabilities it has,
> which dpkg does not.  I've not needed to look into this is more depth
> than that (such as by reading detailed apt docs and/or the apt source
> code) to find out exactly what apt stores and why it needs it.
> Jonathan

Thanks, I appreciate the nuances of that reasonable explanation.
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