Use this command to disable it

sudo bash -c ‘echo “Hidden=true” >> /etc/xdg/autostart/update-notifier.desktop’

Change the default SSH port in Ubuntu, perform the following steps with root privileges:

1. Open the /etc/ssh/sshd_config file and locate the line:
   #Port 22
2. Then,add
   Port 2200
3. Restart the SSH server:
   

   sudo systemctl restart sshd

sudo adduser USERNAME

sudo usermod -aG sudo USER

• Click the file name in a GitHub
• Click Raw to display the file contents.
• You will see the file’s url link

In the command line, run

curl -OL https://raw.githubusercontent.com////path/to/file  (this is the file’s url link)

O means that curl downloads the content
L means that curl follows the redirection

To quit the vi editor without saving any changes you’ve made:

1.  press Esc.
2. Press : (colon).
3. Enter the following:
   q!
   This will quit the editor, and all changes you have made to the document will be lost.

With Ubuntu 18.04 Canonical introduced new network management called Netplan. In nutshell Netplan allows to directly configure network and/or switch between two network configuration daemons networkd and NetworkManager. By default networkd is configured for Ubuntu Server and NetworkManager for Ubuntu Desktop.

Go to   /etc/netplan/01-netcfg.yaml configuration file and change it:

FROM:

TO:

apply changes by executing:

$ sudo netplan apply

sudo apt-get install ubuntu-desktop