>>145のサイトの方法でやってるけど
/etc/fonts/conf.d/51-local.conf変更前
# fc-cache -fv
# fc-match :lang=ja
wqy-zenhei.ttc: "WenQuanYi Zen Hei" "中等"
# fc-match serif:lang=ja
wqy-zenhei.ttc: "WenQuanYi Zen Hei" "中等"
# fc-match sans-serif:lang=ja
wqy-zenhei.ttc: "WenQuanYi Zen Hei" "中等"
# fc-match monospace:lang=ja
wqy-zenhei.ttc: "WenQuanYi Zen Hei Mono" "中等"
/etc/fonts/conf.d/51-local.conf変更後
# fc-cache -fv
# fc-match :lang=ja
migu-1m-regular.ttf: "Migu 1M" "Regular"
# fc-match serif:lang=ja
migu-1m-regular.ttf: "Migu 1M" "Regular"
# fc-match sans-serif:lang=ja
migu-1m-regular.ttf: "Migu 1M" "Regular"
# fc-match monospace:lang=ja
migu-1m-regular.ttf: "Migu 1M" "Regular"
~/.config/fontconfig/fonts.confはMigu 1Cにしてる。