Maybe it is my impression, but the combination mentioned in the title just does not work. After a successful synchronization with the repository Eclipse will insist that there are still local changes, but SVN will refuse to commit them. When forcefully committed (overwrite and commit) the repository will claim to have changes which however don’t show up in a diff etc.
I believe that this is a problem with recent SVNKit implementations since I so far did not have any problems with the Native JavaHL 1.6.12 version. There is a nice blog post  by Lorand Somogyi on how to get it.
The short story:
sudo apt-get install libsvn-java
and add this to vmargs in eclipse.ini:
[update 2014.01.26] Find the library location with
find / 2>/dev/null | grep “javahl”
 Subversive with JavaHl under Ubuntu