# 内核
经过测试一般Ubuntu要三个内核并存,如果一个内核启动出错就用另一个启动。
```bash
#查看当前系统的内核版本
uname -a
Linux XT2000 4.15.0-169-generic #177-Ubuntu SMP Thu Feb 3 10:50:38 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
#查看所有的内核版本,可以看到下面有三个内核分别是4.15.0-163、4.15.0-166、4.15.0-169
dpkg --get-selections | grep linux
binutils-x86-64-linux-gnu install
console-setup-linux install
libselinux1:amd64 install
linux-base install
linux-firmware install
linux-generic install
linux-headers-4.15.0-163 install
linux-headers-4.15.0-163-generic install
linux-headers-4.15.0-166 install
linux-headers-4.15.0-166-generic install
linux-headers-4.15.0-169 install
linux-headers-4.15.0-169-generic install
linux-headers-generic install
linux-image-4.15.0-142-generic deinstall
linux-image-4.15.0-143-generic deinstall
linux-image-4.15.0-144-generic deinstall
linux-image-4.15.0-147-generic deinstall
linux-image-4.15.0-151-generic deinstall
linux-image-4.15.0-153-generic deinstall
linux-image-4.15.0-154-generic deinstall
linux-image-4.15.0-156-generic deinstall
linux-image-4.15.0-158-generic deinstall
linux-image-4.15.0-159-generic deinstall
linux-image-4.15.0-161-generic deinstall
linux-image-4.15.0-162-generic deinstall
linux-image-4.15.0-163-generic install
linux-image-4.15.0-166-generic install
linux-image-4.15.0-169-generic install
linux-image-generic install
linux-libc-dev:amd64 install
linux-modules-4.15.0-142-generic deinstall
linux-modules-4.15.0-143-generic deinstall
linux-modules-4.15.0-144-generic deinstall
linux-modules-4.15.0-147-generic deinstall
linux-modules-4.15.0-151-generic deinstall
linux-modules-4.15.0-153-generic deinstall
linux-modules-4.15.0-154-generic deinstall
linux-modules-4.15.0-156-generic deinstall
linux-modules-4.15.0-158-generic deinstall
linux-modules-4.15.0-159-generic deinstall
linux-modules-4.15.0-161-generic deinstall
linux-modules-4.15.0-162-generic deinstall
linux-modules-4.15.0-163-generic install
linux-modules-4.15.0-166-generic install
linux-modules-4.15.0-169-generic install
linux-modules-extra-4.15.0-142-generic deinstall
linux-modules-extra-4.15.0-143-generic deinstall
linux-modules-extra-4.15.0-144-generic deinstall
linux-modules-extra-4.15.0-147-generic deinstall
linux-modules-extra-4.15.0-151-generic deinstall
linux-modules-extra-4.15.0-153-generic deinstall
linux-modules-extra-4.15.0-154-generic deinstall
linux-modules-extra-4.15.0-156-generic deinstall
linux-modules-extra-4.15.0-158-generic deinstall
linux-modules-extra-4.15.0-159-generic deinstall
linux-modules-extra-4.15.0-161-generic deinstall
linux-modules-extra-4.15.0-162-generic deinstall
linux-modules-extra-4.15.0-163-generic install
linux-modules-extra-4.15.0-166-generic install
linux-modules-extra-4.15.0-169-generic install
linux-sound-base install
pptp-linux install
syslinux install
syslinux-common install
syslinux-legacy install
util-linux install
# 可以删除多余的不用的内核
sudo apt-get purge linux-headers-3.0.0-12 linux-image-3.0.0-12-generic
#更新grub引导
sudo update-grub
```