Install HP Deskjet 1050 All-in-one J410 printer in Ubuntu 10.04

Uninstall your existing drivers

sudo apt-get remove --purge hplip hplip-gui
sudo apt-get update

Download driver from here

Installation

Execute the following commands,

chmod 777 hplip-3.11.3a.run

./hplip-3.11.3a.run

The process will ask about installation type.
Select the install type automatic.

After installation run the following command,

sudo hp-setup

Note: Ubuntu 11.04 and higher versions can automatically detect the printer. No need to install any hp setup to configure the printer. Check Administration > printing to see your printer.

How to install Firefox 4 in Ubuntu 10.04 and 10.10

Open a Terminal from Applications > Accessories
And execute the following commands,

sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
sudo apt-get update
sudo apt-get install firefox-4.0

You can see Firefox 4 appeared in Applications > Internet > Minefield 4.0