How to upgrade from Ubuntu 18.04 LTS to 22.04 LTS.Tutorial Upgrade Ubuntu 18.04 to 22.04 LTS
Upgrade to 20.04 LTS using the CLI
因为要安装1个软件，需要5.16的内核，只好升级操作系统。
Current System
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
uname -r
4.15.0-101-generic
Step 1: Update Current System
需要确认当前系统本地的所有软件都是最新的版本
确保Ubuntu 20.04.4 LTS安装了所有最新的安全更新和补丁。
sudo apt update #<--Refresh the apt repo
sudo apt upgrade -y #<--Now apply all upgrades
sudo apt-get dist-upgrade -y
sudo apt-get autoremove
sudo apt-get clean
reboot
sudo apt install update-manager-core
sudo do-release-upgrade。
step 2.处理一些错误
软件的PPA一直在报错，是之前安装的Bcompare软件，之前因为一些骚操作，导致public key有问题，显示没有Release文件供数据更新。
cd /etc/apt/sources.list.d/
直接删掉了相关的***.list以及***.list.save
再去更新就圆满完成！
安装中断时，出现锁错误
E: Could not get lock /var/lib/apt/lists/lock. It is held by process 211797 (jammy)
N: Be aware that removing the lock file is not a solution and may break your system.
E: Unable to lock directory /var/lib/apt/lists/
(Resolved)
Please install all available updates for your release before upgrading
(Resolved)
step3.
sudo apt-get autoremove
sudo apt-get clean
step 4.
#reboot
把nginx 配置文件初始化掉了
Step 5: Upgrade from Ubuntu 18.04 LTS to Ubuntu 20.04 LTS
sudo do-release-upgradestep 6.
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.6 LTS
Release: 20.04
Codename: focal
root@vultr:~# uname -r
5.4.0-200-generic
troubleshooting
1.所有的service需要重启
2.elasticsearch 8.15 被升级到8.18，ik版本不对了
https://amtdev.com/how-to-upgrade-ubuntu-from-16-04-to-22-04