today i use lubuntu 16.04 to install with my old pc. but at the stage of install boot program Failed. I tried with the disk position and install from the terminal or insall from lubuntu desktop program,all Failed.

At last,i watched the ouput from the install program.,that it seemes it can’t apt-get install grub-pc with the install,so absolutely,I gave it a network line,all fixed.

简单点：

lubuntu16.04在pc上安装，必须得联网。