I haven't looked into this issue much, but Kannada rendering seems to be affected very much when ttf-freefont is installed. Telugu letters show up between Kannada ones when ttf-freefont is installed.
-- Prevents correct rendering of Unicode text in Indian languages. https://launchpad.net/bugs/6134 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs