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Considering the following command:

# apt-get --simulate --show-upgraded upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
 libimobiledevice0 libpam-ck-connector libparted0debian1
Inst libimobiledevice0 [0.9.7-1ubuntu1] (0.9.7-1ubuntu1.2 Ubuntu:10.04/lucid-updates)
Inst libpam-ck-connector [0.4.1-3ubuntu1] (0.4.1-3ubuntu2 Ubuntu:10.04/lucid-updates)
Inst libparted0debian1 [2.2-5ubuntu5.1] (2.2-5ubuntu5.2 Ubuntu:10.04/lucid-updates)

I can read an Inst line as the following:

Inst <package> [<oldversion>] (<newversion> Ubuntu:10.04/lucid-updates)

Can someone tell me where the Ubuntu:10.04/lucid-updates comes from? - Considering an own repository, how is this configurable?

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up vote 0 down vote accepted

If you read your /etc/apt/sources.list you will see some lines there that look like these

## Major bug fix updates produced after the final release of the
## distribution.
deb lucid-updates main restricted
deb-src lucid-updates main restricted

that is where the updated lists are coming from.

apt-get will read that config file when you issue apt-get update, download the new package lists and when you issue and apt-get upgrade it will download the updated packages for your system based on those lists.

The information for the lists is kept under /var/lib/apt/lists/*_Release files

Here is an example from the file security.ubuntu.com_ubuntu_dists_oneiric-security_Release in that directory:

Origin: Ubuntu
Label: Ubuntu
Suite: oneiric-security
Version: 11.10
Codename: oneiric
Date: Tue, 17 Jan 2012 16:38:19 UTC
Architectures: amd64 armel i386 powerpc
Components: main restricted universe multiverse
Description: Ubuntu Oneiric Security

So in your case the Ubuntu would come from the Origin and 10.04 would come from the Version and the lucid-updates would come from Suite keys.

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Hi Bruno, thanks for your fast reply. I do however understand the general process of an apt-get upgrade. In this case I'm wondering where apt-get takes the Ubuntu:10.04/lucid-updates part from. I cannot explain to myself where especially the Ubuntu:10.04 part comes from. The last part (lucid-updates) could come from the sources.list file. I hope you can understand my issue now ;) – timbooo Jan 24 '12 at 11:52
Hi timbooo, I have updated the answer with more details on the information you are looking for. – Bruno Pereira Jan 24 '12 at 12:29
Thank you, that's what I was looking for ;) – timbooo Jan 24 '12 at 14:22

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