nanumgothic 폰트를 다운받아 설치한 다음
import matplotlib.pyplot as plt
import matplotlib.font_manager as fm
fe = fm.FontEntry(
fname=r'/usr/share/fonts/truetype/nanum/NanumGothic.ttf',
name='nanumgothic')
fm.fontManager.ttflist.insert(0, fe)
plt.rcParams["font.family"] = "nanumgothic"