Ubuntu 20.04 LTS After installing the desktop, the system will jam

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A recent player reaction: Ubuntu 20.04 LTS is installed on raspberry PI 4B. After manually installing the desktop with one of the following commands, the system will jam.

sudo apt-get install xubuntu-desktop
sudo apt-get install lubuntu-desktop
sudo apt-get install kubuntu-desktop
sudo apt-get install ubuntu-desktop

The reason is very simple: Raspberry Pi 4B 1GB memory is not large enough, at least 2 GB memory system to run smoothly!!!

PS:
Ubuntu_20.04_LTS Download link ：

Ubuntu Server on a Raspberry Pi 2, 3 or 4