How to remove launcher icon from Gnome launcher Bar

Because i am not a big fan of Ubuntu’s Unity, i am using Gnome desktop environment in Ubuntu 13.10. I have a shortcut for Chromium, Firefox etc in the Gnome launcher.

remove gnome launcher

But when i tried to remove the launcher from there. I was not able to remove, when i right click on the icon i only saw Launch and Properties option.

Then finally i was able to remove it. To remove the icon from Gnome launcher just hold on Windows + Alt key then right click on the launcher icon. Now you will see Move and Remove from Panel option.

Click on Remove from the Panel then remove the launcher which you do not prefer to keep.

sudo: unable to resolve host Dell-Inspiron-3421 in Ubuntu

I was changing the hostname in Ubuntu 13.10 but after changing the hostname i got this error: “sudo:unable to resolve host Sudeep-Inspiron-3421”.

I got this error because we need to have same hostname in both the file(hosts and hostname). To fix this error type the following in the Terminal to open the file and write the same hostname in both the files (hosts and hostname). 

sudo gedit /etc/hosts/

In this file generally the hostname in written in the second line. You will see the first two line similar to this:
127.0.0.1 localhost
127.0.1.1 Dell-Inspiron-3421

Next enter this in the terminal and write the same hostname written in previous file.

sudo /etc/hostname

Now restart your computer and you will not get the error.