Ubuntu 16.04 Chinese font has seemed a bit odd to me since Day 1, but I probably have got used to it. I didn’t quite realize it until Graham Ou’s answer on Quora pointed it out, that I have been reading the Japanese version of the same characters. Here’s how you should change it.
Ubuntu 16.04 默认CJK中日韩字体是Noto Sans CJK，在英文系统没有指定语言的情况下，默认会显示日文字形。因为多数网页有指定字体或语言，PDF有确定的字体，而我自己的电脑里很少有汉字的纯文本文件，过去半年我都一直以为这是系统默认字体的特别设计，没有意识到真正的问题。
可以看这几个字日文与中文的写法有小小不同：低写直浅房
要让Ubuntu 16.04正确显示中文字形，解决方案很简单，只需要修改 /etc/fonts/conf.d/64-language-selector-prefer.conf里面几个字体的优先级即可。
The solution is simple, changing the order of the fonts in /etc/fonts/conf.d/64-language-selector-prefer.conf will do.
Credit: 如何正确为 Noto Sans CJK 配置 fontconfig 使中文不会被显示为日文字型？ – Menci 的回答 – 知乎
修复 Ubuntu 英文环境汉字显示 – Mo’s ideas