몇 번 헤매다 답을 찾았다. https://stackoverflow.com/questions/42097053/matplotlib-cannot-find-basic-fonts I had this exact same problem on a Vagrant VM running Ubuntu Xenial 64-bit. No matter how many fonts I had already installed, matplotlib was having a problem with the “system” font name “sans-serif”. I fixed it by: Stopping JupyterInstalling font-manager: sudo apt install font-managerCleaning the matplotlib cache directory:…… jupyter matplot 한글 폰트 설정 계속 읽기