参见原博：error : no symbol table
升级到ubuntu18.04后，开机出现：

error：no symbol table
press any key to continue…

sudo fdisk -l  

This will list all partitions on your HDD (find under Type section the Ubuntu or Linux and its Device (like /dev/sda)) then, do:

sudo grub-install /dev/sda  

note that is sda and NOT sda1

sudo update-grub  

sudo reboot