Linux novice: unable to locate package error solution

The original address: http://www.cppblog.com/colorful/archive/2012/04/29/173122.html

Unable to locate package: Unable to locate package: Unable to locate package: Unable to locate package: Unable to locate package: Unable to locate package

    [email protected]:~$sudo apt-get install mysql-server mysql-client [sudo] password for letuknowit: Reading package lists…

      [email protected]:~$sudo apt-get install mysql-client [sudo] password for letuknowit: Reading package lists… Done Building Dependency Tree Reading State Information… Done E: Unable to locate package mysql-server E: Unable to locate package mysql-client [email protected]:~$

    I found the problem was that I changed the source of the software before executing sudo apt-get install, but I forgot to update it, so I executed the following command:

      sudo apt-get update

    Sudo apt-get install sudo apt-get install sudo apt-get install Unable to locate packet Unable to locate packet

    Attached is another article:
    The original address: http://blog.chinaunix.net/uid-22002627-id-3475650.html
    Encounter this problem after find this thread is turned around When use apt – get update package often appear error Unable to locate the package update, especially in the ubuntu server, the solution is: to update the apt – get # sudo apt – get the update after the execution, problem solved. #sudo apt-get install mysql-client
    #sudo apt-get install mysql-client
    #sudo apt-get install mysql-client


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