ubuntu checks the programs occupying a certain port

To view port usage, use the netstat command.
View the connected service ports (ESTABLISHED)

netstat -a

View all service ports (LISTEN, ESTABLISHED)

netstat -ap

To view the 8080 port, you can combine it with the grep command:

netstat -ap | grep 8080

If you want to view the 8888 port, enter in the terminal:

lsof -i:8888

To stop the program using this port, use kill + the corresponding pid