Fig. 1.2 A picture of a tree

Is there a way I can tell it to caption them all at once? If I set them all up with captions, can I somehow get it to number them automatically?

(I need it to change from fig. 1 to fig. 2 and stuff, so I'd need to set up some kind of chapters?)

Or if you know any other freeware that'll do that for me...(I'm using ubuntu)

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Down is the other direction.

First, set up your document so that it has the different sections/chapters labeled. For each chapter title, you must use a certain paragraph style. Press F11 to view the styles window. By default, the first level of "outlining" is the style "Heading 1". Right-click on this in the "Styles and Formatting" window (from F11) and click "modify". Modify that style to how you want it and apply it (by double-clicking) to all of your chapter titles.

Go to Tools>Outline Numbering and for the first level, change "Paragraph Style" to "Heading 1" and "Number" to "1, 2, 3, ...". This sets OOo to recognize the paragraph style "Header 1" as outline level one.

Now, for each picture you insert, select the picture and go to Insert>Caption. In "Category" type "Figure" (without quotes). Click "Options" and set the level to 1 and separator to a period. Then, the figures should appear how you want them throughout the document and the numbers will automatically update.

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I once heard the voice of God.
It said "Vrrrrmmmmm." Unless it was just a lawn mower.