When you have a install problem on Language Support for Korean, you can setup Korean language manually . follow blow solution.
sudo apt-get install language-pack-ko-base ttf-unfonts-extra ibus-hagul
if you failed to install ttf-unfont-extra with atp-get , download the package of ttf-unfonts-extra on this site,
http://packages.ubuntu.com/natty/ttf-unfonts-extra
ibus problem is located in this URL :
https://bugs.launchpad.net/ubuntu/+source/ibus-hangul/+bug/840823
I add "unset IBUS_ENABLE_SYNC_MODE" in end of /etc/bash.bashrc.
I met a problem again when I start chrome with unity. I solved this issue like this.
I add I add "unset IBUS_ENABLE_SYNC_MODE" in /opt/google/chrome/google-chrome
I met a problem again when I start thunderbird with unity. I solved this issue like this.
I add I add "unset IBUS_ENABLE_SYNC_MODE" in /usr/bin/thunderbird
I confirmed ibus is working well on several application.