cache->open failed. Cannot update.

If you have problem like this:
Update manager not working. Showing massage like below
cache->open() failed, please report.

Run this command to terminal
$ sudo rm /var/lib/apt/lists/* -vf

Ubuntu Tweaks

Ubuntu Tweaks made configuring ubuntu easier for any newbie. It provides many useful desktop and system options that the default desktop environment doesn't provide. At present, it's only designed for the Ubuntu GNOME Desktop, and always follows the newest Ubuntu distribution.

Features of Ubuntu Tweak

• View of Basic System Information(Distribution, Kernel, CPU, Memory, etc.)
• GNOME Session Control
• Auto Start Program Control
• Quick install popular applications
• A lot of third-party sources to keep applications up-to-date
• Clean unneeded packages or cache to free disk space
• Show/Hide and Change Splash screen
• Show/Hide desktop icons or Mounted Volumes
• Show/Hide/Rename Computer, Home, Trash or Network icon
• Tweak Metacity Window Manager's style and behaviour
• Compiz Fusion settings, Screen Edge Settings, Window Effect Settings, Menu Effect Settings
• Set the Shortcuts to archive quicker access your favourite applications
• GNOME Panel Settings
• Nautilus Settings
• Advanced Power Management Settings
• System Security Settings
• And many other in process...    

I think i should not make you wait anymore, so slip to this link
ubuntu tweaks

How to remove splash screen in Ubuntu

If you want to remove your ubuntu splash screen and make a faster boot, then type in terminal 

$ sudo vi /etc/default/grub  

Then editand change this line

GRUB_CMDLINE_LINUX_DEAULT = "quite splash"  and just remove 'splash'

Then type in terminal 

$ sudo update-grub 

$ sudo reboot

Ubuntu version update notification(stable release)

To enable the graphical version update notification (stable release) on update manager. Enter below command on terminal and set "prompt=normal" by using vi or any text editor.

$ sudo vi /etc/update-manager/release-upgrades

release notification automatically appear in update-manager whenever it available.

install ubuntu on kubuntu

$ sudo apt-get update && sudo apt-get install ubuntu-desktop

Logout and select you session.

Ubuntu software install uninstall in command line

Search package : $ apt-cache search [SOFTWARE NAME]

Package install : $ sudo apt-get install [SOFTWARE NAME]

Listing all installed package : $ dpkg --list

Searching installed package : $ dpkg --list [ PARAMETER ]
e.g. $ dpkg --list chrom*

Removing package : $ sudo apt-get remove [SOFTWARE NAME]

Remove package along with all configuration files : $ sudo apt-get --purge remove lighttpd