If you have downloaded the .deb file from Symantec, double clicking on the file will open Ubuntu Software Center and you will see a button to install the software. Once you click install, it will ask you for your password and then install the software.
If the above procedure does not work, you will need to use the terminal and type in the command in the readme file.
For example the readme file may tell you to type
dpkg -i *.i386.deb
as root. Linux has a special user called
root, but in some distributions, like Ubuntu, it is disabled by default. To do something as root, when it is enabled, you have to first type
suEnter, then enter root's password. Then you get the root prompt:
. Once you get the root prompt you enter the command. However, this is not for Ubuntu.
sudo to the front of the command you want to use as root. You do not (cannot) use the
su command first and then use the command you want. So you type:
sharon@sharon:~$ sudo dpkg -i *i386.deb
This is the same command as above but with
sudo in front. Once you type a command with
sudo in front, the computer will ask for your password. The cursor will not move when you type the password. It will look like nothing is happening at the terminal. This is normal. Enter the password and hit Enter.
Then the computer will execute the commad that you typed after
sudo as if you are the root. Thus, even if you are not root, you get temporary power of the root by using the
sudo command. In Ubuntu the
root account is disabled by default for security. The only way to act as the root is to use the
sudo command. This default can be changed, but that is not recommended.
Hope this helps