>From the command line you should be able to execute the program "android " 
which will bring up the Android SDK Manager. 
Here I found that the *Android SDK Platform-tools* for the rev 20 were not 
installed.
Install whatever is missing and then the ADT should work fine again.

An alternative to update all platforms and walk away for a while is to 
execute:   
android-sdk-linux/tools/android update sdk --no-ui

Regards,

Steve

------------------------------------------------------------------------------------------------------------------------------------------------------------------

On Sunday, 1 July 2012 09:25:59 UTC+1, Arul Govindaraj wrote:
>
> The ADT Eclipse just disappeared after the latest update, I guess "Rev. 
> 20". Its not there in the new project wizard, perspectives, preference, 
> etc. It was just fine till yesterday. Could someone help me resolve.
>
> My OS: Ubuntu 12.04
> With Eclipse Version: 3.7.2
>
> When I try to install again it says, its already installed. Error details 
> below:
> Cannot complete the request.  See the error log for details.
> "Android Development Tools" will be ignored because it is already 
> installed.
>
> Thanks
>

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