Similarly, this can also solve the problem that Linux Ping does not sleep on the host because the network is not turned on

Solve the problem of failed to start LSB: bring up/down Networking: caused by MAC address

Here are two solution I found online:

1. Close NetworkManager
2. Change MAC
I tried, but failed

Later, I found that the name of my network card was wrong, so I changed it, and the memory size of the virtual machine became like this

Later, I copied the network card and changed its name