1 进入网站 https://kernel.ubuntu.com/~kernel-ppa/mainline/

2 找到对应版本，下载amd64的4个deb(排除low latency)，例如：

wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5.19/linux-headers-5.5.19-050519_5.5.19-050519.202004210831_all.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5.19/linux-headers-5.5.19-050519-generic_5.5.19-050519.202004210831_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5.19/linux-image-unsigned-5.5.19-050519-generic_5.5.19-050519.202004210831_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5.19/linux-modules-5.5.19-050519-generic_5.5.19-050519.202004210831_amd64.deb

3 安装

sudo dpkg -i *deb

4 重启后，就可以应用新内核了