Ubuntu uses Systemback for system backup and restoration

install systemback

Run each line individually -- add keys and installer

sudo sh -c 'echo "deb [arch=amd64] http://mirrors.bwbot.org/ stable main" > /etc/apt/sources.list.d/systemback.list'
sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key 50B2C005A67B264F
sudo apt-get update
sudo apt-get install systemback

open systemback

 After opening systemback, enter the password. After entering the password, a 'green check mark' will appear to indicate that the password is correct, click OK

The entered page is like this 

 Create a restore point

1. The default in the red box in the figure below is home, and I created a new folder backup under home as the backup folder

 2. Click Create New

3. The restore point is being created. When the progress reaches 100, it will be successful, and it will be recorded in the restore point on the left. Of course, you can also click the red word "interrupt" to cancel the creation of the restore point

 4. After the restore point is created, there will be a new record here. It can be seen here that I have created two restore points

 system Restore

1. Select a restore point. After selecting one of them, the function of "System Restore" in the function menu will change from unclickable to clickable

 2. Click System Restore, as shown in the figure below, it is recommended to click Complete Restore, or you can selectively restore according to your own situation, and then click Next

3. After clicking the next step in the above picture, a confirmation and cancellation prompt will appear, here my choice is "Start"

4. After clicking start in the above picture, the progress will appear. Of course, you can also click the red "interrupt" to abort the restoration operation

 5. After the restoration is successful, you will be prompted to restart the computer and force restart, so save the documents in advance, etc.

Note: Restoration is risky, please save the data in time and operate with caution