How to recover gnome-shell

If you found that your gnome-shell task bar missing?
And your desktop seems plain and not able to access applications menu.
You can recover your lost desktop. Follow the steps.

Apply the key combinations, Ctrl + Alt + T 
A terminal will open. Enter the following commands,

sudo su
gnome-shell --replace

You can see that, your desktop panels and menus appear again

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How to solve message "Remove and check cartridge" on HP printers

The message "Remove and check cartridge" or "Remove and check color cartridge" means a cartridge could be defective. 

Before replacing the cartridge, try these solutions:

Solution 1 : for some HP printers

• Chech the door at the back of the printer. It must be closed.

Solution 2: (for HP PSC 1503, 1504, 1507, 1508, 1510, 1510v, 1510xi, 1513 et 1514)

• Check the cartridge

Solution 3: reset the printer:

1. Power off the printer.
   
2. Remove the power cable from the back of the printer.
3. Wait for 2 minutes.
4. Connect the power cable to the printer.
5. Switch on.

Solution 4:

• Remove the faulty cartridge.
• Power of the printer and close the door.
• Switch on the printer: the screen says you have to install a cartridge. Put it back.

Solution 5:

• A faulty sensor can lead to this error.
• Slamming the door (not too strong !) can solve the problem

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Change grahical Ubuntu boot splash into text mode

gedit /etc/default/grub

Find the word "quiet splash".
Remove the word "quiet splash".

Save the file.

Update the grub.

update-grub

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