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Before you start working on packages on Ubuntu Server, it is a good idea to decide what tool you want to use. It s a good idea because many tools are available for Ubuntu Server and each of them uses its own database to keep track of everything installed. To prevent inconsistencies in software packages, it s best to choose your favorite utility and stick to that. In this book I ll focus on the apt-get utility, which keeps its database in the /var/lib/apt directory. This is my favorite utility because you can run apt-get as a very easy and convenient tool from the command line to perform tasks very quickly. The apt-get utility works with commands that are used as its argument, such as apt-get install something. In this example, install is the command you use to tell apt-get what you really want to do. The following four package management commands are the most important building blocks when working with apt-get: update: This is the first command you want to use when working with apt-get. It updates the list of packages that are available for installation. Use it to make sure that you install the most recent version of a package. upgrade: Use this command to perform an upgrade of your server s software packages. install: This is the command you want to use every time you install software. It s rather intuitive. For example, if you want to install the Xen software package, you would just type apt-get install xen. remove: You ve probably guessed already, but you ll use this one to remove installed packages from your server.

Figure 18-1. Any edits to the image are made live, so it s a good idea to move the adjustment dialog box out of the way. You can also add a comment in the text field below the image. This is then attached to the image for future reference and can act as a useful memory aid. A note of caution is required when tweaking images with F-Spot, because there is no traditional undo mechanism. However, F-Spot keeps a copy of the original image alongside the modified one, which you can access by clicking Photo Version Original. It s possible to create a new version of the image complete with modifications by clicking Photo Create New Version. You can then name this separately and, if necessary, continue to edit while retaining both the original and the intermediate version. You can do this as many times as you want, perhaps to save various image tweaks to choose the best one at a later date.

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F-Spot s cataloging power comes from its ability to tag each image. A tag is simply a word or short phrase that can be attached to any number of images, rather like a real-life tag that you might find attached to an item in a shop. After images have been tagged, you can then filter the images by using the tag word. For example, you could create a tag called German vacation, which you would attach to all images taken on a trip to Germany. Then, when you select the German vacation tag, only those images will be displayed. Alternatively, you could be more precise with tags you could create the tags Dusseldorf and Cologne to subdivide pictures taken on the vacation.

Before you start managing packages on Ubuntu Server, you probably want to know what packages are already installed, and you can do this by issuing the dpkg -l command. It ll generate a long list of installed packages. Listing 3-2 shows a partial result of this command.

If your collection involves a lot of pictures taken of your children at various stages during their lives, you could create a tag for each of their names. By selecting to view only photos tagged with a particular child s name, you could see all the pictures of that child, regardless of when or where they were taken. Images can have more than one tag. A family photo could be tagged with the words thanksgiving, grandma's house, family meal, and the names of the individuals pictured. Then, if you searched using any of the tags, the picture would appear in the list. A handful of tags are provided by default: Favorites, Hidden, People, Places, and Events. To create your own tags, right-click under the tag list on the left of the F-Spot program window and select Create New Tag. Simply type in the name of the new tag in the dialog box and click OK. If you tagged items on importing, these will appear under the Import Tags parent. Drag and drop these tags to the appropriate parent tag (Germany under Places, for example).