环境：

Ubuntu 20.04 TLS

1、查看当前已有内核

dpkg --list|grep linux-image

dpkg --list|grep linux-headers

2、查看当前使用的内核版本

uname -r

3、卸载内核命令**(如果不想卸载内核不要执行这些命令)**

sudo apt purge linux-image-xxx# xxx表示上图中后面的数字

sudo apt purge linux-headers-xxx

sudo apt autoremove # 自动删除不用的安装包

卸载完内核后需要执行下列命令更新grub

sudo update-grub

4、关闭内核的自动更新

sudo apt-mark hold linux-image-xx.x.x-xx-generic

sudo apt-mark hold linux-headers-xx.x.x-xx-generic

sudo apt-mark hold linux-modules-extra-xx.x.x-xx-generic

5、重新启用内核更新

sudo apt-mark unhold linux-image-xx.x.x-xx-generic

sudo apt-mark hold linux-headers-xx.x.x-xx-generic

sudo apt-mark hold linux-modules-extra-xx.x.x-xx-generic

6、关闭内核自动更新(配置方法)[正在实验中]

# 修改以下文件

sudo vim /etc/apt/apt.conf.d/10periodic

sudo vim /etc/apt/apt.conf.d/20auto-upgrades

#关闭自动更新

APT::Periodic::Update-Package-Lists "0";

APT::Periodic::Download-Upgradeable-Packages "0";

APT::Periodic::AutocleanInterval "0";

APT::Periodic::Unattended-Upgrade "0";

#开启自动更新

APT::Periodic::Update-Package-Lists "2";

APT::Periodic::Download-Upgradeable-Packages "1";

APT::Periodic::AutocleanInterval "0";

APT::Periodic::Unattended-Upgrade "1";