Linux system cannot be started after installation

1. Check the disk information and confirm that the system is installed on that disk

sudo df -lh

or

sudo fdisk -l

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2. Mount

sudo mkdir /mnt/ubuntu #建立挂载点
sudo mount /dev/sda2 /mnt/ubuntu #挂载
 
#如果引导安装在单独磁盘上 挂载引导
sudo mount /dev/sda6 /mnt/ubuntu/boot

3. Install grub

#安装grub
sudo grub-install --boot-directory=/mnt/ubuntu/boot /dev/sda

4. Restart

sudo reboot

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