I was filing a bug report for this when I saw this "duplicate." This issue still exists in the stable Oneiric release (17 Oct 2011). I'm attaching a screenshot that shows how I've removed bookmarks for Music, Pictures, Videos, etc but they are still showing up in the Nautilus Sidepane.
I hope this bug is addressed because all these default bookmarks take up the majority of space on the Sidepane. For users that don't use these default bookmarks, it would really be nice to be able to remove them so space can be created for bookmarks of the user's choosing. ** Attachment added: "Unable to remove default bookmarks (e.g., Music) from Sidepane" https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/821544/+attachment/2553848/+files/Screenshot%20at%202011-10-17%2008%3A46%3A52.png -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/821544 Title: Places in the sidebar keep listing non existent folders Status in “nautilus” package in Ubuntu: Confirmed Bug description: On Ubuntu Oneiric Alpha 3 (session Gnome fallback mode), Nautilus displays on its sidebar 3 lists of emplacements: "Bookmarks", "Computer" and "Network". In the section "Computer", folders created by default on "home" are listed: "Documents", "Downloads", "Music", "Pictures", etc. If we remove on "home" one of these folders (for example "Music"), it's still listed on the section "Computer", even if we kill and restart Nautilus. If we click on the non existent folder on the sidebar, we have this error message: >Could not find "/home/ubuntu/Music". >Please check the spelling and try again. Expected result: non existent folders should not be listed. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: nautilus 1:3.1.4-0ubuntu2 ProcVersionSignature: Ubuntu 3.0.0-7.9-generic 3.0.0 Uname: Linux 3.0.0-7-generic i686 Architecture: i386 CasperVersion: 1.276 Date: Fri Aug 5 03:00:14 2011 ExecutablePath: /usr/bin/nautilus LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110803.1) ProcEnviron: SHELL=/bin/bash LANG=en_US.UTF-8 SourcePackage: nautilus UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/821544/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

