Just figured out a quicker way to update our Ubuntu sytem, instead of using the automatic update system (which can take hours to download almost a Giga of packets, caused by saturation of update servers, especially the first days after a new Ubuntu version has been launched).
It is also very interesting when you have to update several systems, in my case three.You don't have to burn any CD!
- Download the alternate CD ISO image (assume you store it in your home directory).
You could use the Torrent, which downloads so much quicker.
- Next we'll mount that ISO image, and launch the upgrade process so that it uses almost all packages from the CD.
mount -o loop -t iso9660 ~/ubuntu-9.04-alternate-i386.iso /media/cdrom0
Maybe, you'll still have to download some packages, depending on how much additional software you installed on your system, but at least the most of them you just downloaded with more speed (a big file, instead of hundreds of small packages).