I just did a fresh install of Ubuntu 13.10 (actually, I've done two fresh installs, hoping that trying again would get this working).
I don't seem to have the ability to add or remove bookmarks from Nautilus. The ones that are there by default (Home, Desktop, Documents, etc.) work fine. I can right click on them and rename them. However, I cannot remove any of them. The option is there "Remove" but disabled/grayed out.
The same is true if I try to add bookmarks. I go to "Files -> Bookmarks", and all the bookmarks show up, but the buttons at the bottom to add, remove, or re-order the bookmarks are simply disabled.
What am I doing wrong?
Custom bookmarks
To add and remove custom bookmarks, refer to the documentation in Files ▸ Help ▸ Edit folder bookmarks:
The "gear button" is on the right side of Nautilus:
It will be grayed out if the location you've opened is already bookmarked.
Places
The bookmarks seen under the "Places" heading are an exception:
They're not just bookmarks, but XDG user directories with a separate configuration backend, so the Nautilus developers deliberately chose to disable removing them.
The issue of working around this limitation is being discussed in this question.
I think I may have stumbled upon a way to add a bookmark for, say, the UbuntuOne folder.
First up, I connected to a SMB server, and I found that I was able to create a bookmark for this connection. This action created the Bookmarks entry in the left pane of Nautilus. Not sure if this is really necessary - it is just what I did.
Then I right-clicked on one of the folders in the Home folder (one I did not want to Bookmark say, Videos), and selected Copy to. This opened up the Select destination window.
I could then right-click on the folder I wanted to Bookmark and add it to the Bookmarks.
After that, I could rename, or remove, the bookmark if I wanted to.
If you want to completely remove Public Videos Pictures ... folders in home directory and their bookmarks in Nautilus