Yes, app, i've already tried tightvnc. (and a bunch of others
Then, i made some research and found out that the problem is known and is related to ubuntu's default vnc server not supporting these chars.
The solution for the problem was installing another vnc server on linux, which, although looks like a simple task, took me all the afternoon to not get anything. As usual, linux let me down.
In the meanwhile, i leave this question here and at the ubuntuforums
for the linux-savy out there that might be able to point me in the right direction.
BTW: i followed this guide
and got the same problem mentioned in the replies.