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Why do you want to remove it?Why don't you ask the Ubuntu developers/support, this is not related to C::B at all, so this post is not for this forum.Please read the rules to understand why!
You don't need to remove the prebuild wxWidgets for cross-compiling.Read:http://wiki.codeblocks.org/index.php?title=Cross_Compiling_wxWidgets_Applications_on_Linux