1. pandoc必须要用sudo才能运行这是我没有想到的

sudo pandoc ./results/output.md --pdf-engine=xelatex  -o ./results/output.pdf

2.pdflatex安装失败，只能安装wkhtmltopdf

sudo apt-get install wkhtmltopdf

sudo pandoc ./results/output.md --pdf-engine=wkhtmltopdf -o ./results/output.pdf