参考文档：https://www.hostwinds.cn/tutorials/how-to-upgrade-from-ubuntu-18-04-lts-bionic-beaver-to-ubuntu-20-04-lts-focal-fossa

注意升级会升级当前软件版本,docker 会remove ，需要提前做好backup

#18.04 update 20.04 ，bionic 改成 focal 代号名称
sed -i 's/bionic/jammy/g' /etc/apt/sources.list 
sed -i 's/bionic/jammy/g' /etc/apt/sources.list.d/*.list

#16.04 update 18.04
sed -i 's/xenial/bionic/g' /etc/apt/sources.list 
sed -i 's/xenial/bionic/g' /etc/apt/sources.list.d/*.list

#!/bin/bash
sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get dist-upgrade
sudo apt-get autoremove
sudo apt-get install update-manager-core
sudo do-release-upgrade
sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get dist-upgrade

#清理旧的内核
sudo apt autoremove --purge

lsb_release -a 
cat /proc/version
reboot

vim /etc/docker/daemon.json
{
"storage-driver": "overlay2"
}

#centos  update  ，remove  old kernel
sudo package-cleanup --oldkernels --count=1 

sudo pro fix USN-7710-2
sudo pro fix USN-7280-2
sudo pro fix USN-7488-1
sudo pro fix USN-7469-3
sudo pro fix USN-7271-1