安装Numix

sudo apt install numix*

安装Papirus

sudo add-apt-repository ppa:papirus/papirus
sudo apt update 
sudo apt-get install papirus-icon-theme

安装TweakTool

sudo apt install gnome-tweak-tool

打开TweakTool设置

效果

参考链接

https://blog.csdn.net/ice__snow/article/details/80152068