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To access the trash folder, select \menu{Places \then Computer} from the top panel, then choose \menu{Trash} from the list of places in the left-hand sidebar of the window that appears (alternatively, click on the trash applet at the far right of the bottom panel). To remove items from this folder and restore them to your computer, right-click on the items you want and select \button{Restore}, or otherwise drag them wherever you would like (we recommend a memorable location, such as your home folder or desktop).
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Over time, Ubuntu's software packaging system can accumulate unused packages or temporary files. These temporary files, also called caches, contain package files from all of the packages that you have ever installed. Eventually, this cache can grow quite large. Removing them allows you to reclaim space on your computer's hard drive for storing your documents, music, photographs, or other files.