I have found a tool that allows to customize and then save Grub menu changes such as:
1) Which operating system loads by default
2) The amount of time the startup prompt option takes before starting automatically
This is usually the first customization task I need to do whenever I dual boot Linux and Windows.
The graphical tool’s name is grub-customizer and it is available from an Ubuntu ppa repository. The developer’s profile is here
sudo add-apt-repository ppa:danielrichter2007/grub-customizer sudo apt-get update sudo apt-get install grub-customizer
sudo ufw status
confirm if firewall is running. This command displays whether the ufw firewall is running and it also lists the active rules
sudo ufw enable
enable the firewall and also force it to load from system start
sudo ufw disable
disable the firewall and disable it from loading from system start
After an ubuntu upgrade, I detected lots of activity going on postfix.
I did not want to disrupt other ongoing web activity so I decided to temporarily shut down the postfix server with the following command:
sudo postfix stop