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Re: Optimizing use of /var/cache/apt/archives/ by Synaptic &/or apt-get

Richard Owlett wrote:
> On 01/23/2019 08:53 AM, Pascal Hambourg wrote:
>> Le 23/01/2019 à 15:43, Richard Owlett a écrit :
>>> 1. If /var/cache/apt/archives/ has the same or later version version 
>>> of a package, will Synaptic and apt-get automatically use contents of 
>>> /var/cache/apt/archives/ in preference to downloading whatever is at 
>>> location specified by sources.list?
>> Same version : yes. Later version : no.
>>> 2. If there is no internet connection at the moment, will Synaptic and 
>>> apt-get  use the latest version in /var/cache/apt/archives/ ?
>> apt-get uses a version in the cache if and only if it matches the 
>> requested version, regardless of the internet connectivity.
>> 1) apt decides which version of a package it wants.
>> 2) If that package version is present in the cache, it uses it.
>> 3) Otherwise, it selects a mirror and downloads it from there.
> I may have some re-thinking to do. Due to bandwidth I avoid downloads 
> whenever possible. Instead I purchase DVD sets. That's no real problem 
> for the machine whose purpose resembles a typical user's.
> I have a couple of machines set aside for experimentation. The 
> explicitly have no connectivity to the outside world. My mental image 
> resembled using the cache contents as an local pseudo-repository. I may 
> have to create a real one.

Set up a rig as your own mirror and set those machines' sources.list to
that mirror?

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