My sql installation error in Ubuntu - 12.04

Question

When i write the command

    sudo apt-get install mysql-server-5.5 

I get the following error message

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package mysql-server-5.5
E: Couldn't find any package by regex 'mysql-server-5.5'

Please tell me how to remove it ?

Solution

That error means that the package name is not correct, try

apt-cache search mysql-server

write down the package name you want to install and retry

sudo apt-get install correct-package-name

Another answer might be that you don't have the correct repository where the package is stored. From here you can see that you should enable the security repository. Here you can see how to do that.

Edit:

As Tuim stated, it can also be the '.' in the name, but that's only the case when the exact expression is not found (apt-get manual):

If no package matches the given expression and the expression contains one of ".", "?" or "*" then it is assumed to be a POSIX regular expression, and it is applied to all package names in the database. Any matches are then installed (or removed).

So I still think that you have an issue with the repository.