安装内核

sudo sed -i '$a\deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse \​
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse \
' /etc/apt/sources.list 

sudo apt update
sudo apt-get install linux-headers-5.4.0-90-generic linux-image-5.4.0-90-generic linux-modules-extra-5.4.0-90-generic -y

更新开机引导

sudo cat /boot/grub/grub.cfg | grep menuentry

选择图中高亮Ubuntu, with Linux 5.4.0-90-generic 修改 /etc/default/grub

sudo sed -i 's\^GRUB_DEFAULT.*\GRUB_DEFAULT="Ubuntu, with Linux 5.4.0-90-generic"\' /etc/default/grub

执行sudo update-grub，选择高亮部分参数，再次修改 /etc/default/grub

sudo sed -i 's\^GRUB_DEFAULT.*\GRUB_DEFAULT="gnulinux-advanced-69d45584-f881-4acc-ac17-cfc591751841>gnulinux-5.4.0-90-generic-advanced-69d45584-f881-4acc-ac17-cfc591751841"\' /etc/default/grub 
sudo update-grub

锁定版本

 sudo apt-mark hold linux-headers-5.4.0-90-generic linux-image-5.4.0-90-generic linux-modules-extra-5.4.0-90-generic

重启即可