On Ubuntu 9.10/10.04, Netbeans freezes when you commit your code changes to Subversion from Netbeans. This happens because of a bug in the Gnome keyring support in Subversion 1.6. We can fix it by added the following line to netbeans_default_options in /etc/netbeans.conf:

-J-DsvnClientAdapterFactory=commandline

Committing should work fine from then on.