lubuntu-desktop team mailing list archive

[Jonathan Marsden <jmarsden@xxxxxxxxxxx>]

On 12/23/2011 06:52 AM, amjjawad HOOHAA wrote:

> I have Lubuntu 12.04 installed and it's up and running. I have done all the
> updates and upgrades (
> http://ubuntuforums.org/showpost.php?p=11559293&postcount=23) and now, I
> want to use "zsync" that I already installed. *From my understanding to all
> this, I just need to do this*:


> zsync http://cdimage.ubuntu.com/lubuntu/daily-live/20111222/precise-desktop-i386.iso.zsync


You can't zsync already installed packages, you zsync an ISO image file.
 This updates it to a newer verson of that ISO image, without
re-downloading the parts that have not changed.

zsync is used for updating an ISO image file, one you can then burn to
CD, etc.  It is *not* a way to update an installed system.

> ... "zsync" will NOT update the installed system but will update the
> previously downloaded iso so that you'll get the LATEST Daily Image
> and then you just need to burn a CD and Install all over again,
> right?


Right.  Remember, this is for testing, which includes testing of
installation.

> Now, another doubt: What's the point from all the above if I do:
> 
> sudo apt-get upgrade


This first one should be "update" not "upgrade", I think.

> sudo apt-get dist-upgrade


That updates your existing, already installed, machine.  It does not
test the installer, or the installer slideshow, for example, which may
have been changed between the time you first installed Lubuntu and the
time you do the update.


> Isn't that enough?


No.  They do two *very* different things:

(1) An end user, wanting to keep their machine updated, can do

  sudo apt-get update && sudo apt-get upgrade

to update their already-installed Lubuntu machine.

(2) ISO testers, who will retest installation of Lubuntu from the ISO
image on a variety of machines, and using a variety of different
installation options, need an updated ISO to do that kind of testing
with.  Using zsync can help such testers them obtain an updated ISO
image without wasting Internet bandwidth.

Jonathan