Ubuntu Font Family simply doesn't cover CJK and what you see is another font. Here you can see the UFF coverage: https://wiki.ubuntu.com/Ubuntu%20Font%20Family#Coverage
If you want to request coverage for CJK script, see here: https://launchpad.net/ubuntu-font-family/+milestone/later
PS. FreeSans covers CJK.
Ubuntu Font Family simply doesn't cover CJK and what you see is another font. Here you can see the UFF coverage: https:/ /wiki.ubuntu. com/Ubuntu% 20Font% 20Family# Coverage
If you want to request coverage for CJK script, see here: https:/ /launchpad. net/ubuntu- font-family/ +milestone/ later
PS. FreeSans covers CJK.