Personal Package Archives (PPA) allow you to upload Ubuntu source packages to be built and published as an apt repository by Launchpad.
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If you want to update all the packages other than one package in your Ubuntu system follow this procedure
There are three ways of holding back packages, with dpkg, aptitude or with dselect.
There are thousands of programs available to install on Ubuntu. These programs are stored in software archives (repositories) and are available for installation over the Internet. This makes it very easy to install new programs. It is also very secure, because each program you install is thoroughly tested and built specifically for Ubuntu.
Am I doing something wrong?
My Update Manager is downloading at a rate of about 1Mb/day! The System Monitor shows that about 100 to 400 bytes are downloaded every 5 seconds or so. I have no trouble using e-mail or Firefox at normal speed.
If you want to select Ubuntu mirror which works fastest for you follow these steps this is very important to any ubuntu user to download and install ubuntu packages fastest way.