TortoiseSVN on Windows has a simple and effective explorer that can be used to view the projects and their organization inside a local Subversion repository. There is no TortoiseSVN for Ubuntu.
Instead, the RapidSVN tool nicely fills these shoes. It can be installed easily using the package name rapidsvn.
To explore a local SVN repository, open RapidSVN, right-click on Bookmarks and choose Add Existing Repository. Copy the full path to the directory which holds your local SVN repository. Prefix it with file:// and use that as the URL for RapidSVN. It should now show all the projects and their internal organization.
Tried with: RapidSVN 0.12.0 and Ubuntu 12.04 LTS