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I was following the link GMate and Using Gedit as a Ruby IDE to make my Gedit as IDE. But when all the command was running good,the below one throwing me an error.

kirti@kirti-Aspire-5733Z:~$ sudo apt-get install gedit-gmate
[sudo] password for kirti: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package gedit-gmate

Help me to fix the issue.

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which version of Ubuntu are you using ,details would help – atenz Apr 28 '13 at 7:07
@tijybba ubuntu13.10 i am using. – Arup Rakshit Apr 28 '13 at 7:08
As far as released version goes ,GMate for 13.04 is not yet listed – atenz Apr 28 '13 at 7:16

To install GMate, you have first to add the right PPA. To do so, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the commands below:

sudo apt-add-repository ppa:ubuntu-on-rails/ppa
sudo apt-get update

Once that is done. then you can run:

sudo apt-get install gedit-gmate

See image below:

enter image description here enter image description here

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yes,I did follow,the same way. – Arup Rakshit Apr 28 '13 at 7:09
Just tried it on 13.04, and it worked OK. – Mitch Apr 28 '13 at 7:10
why then I am getting error? should I perform those steps again? – Arup Rakshit Apr 28 '13 at 7:11
Before you do try sudo apt-get upgrade && sudo apt-get update – Mitch Apr 28 '13 at 7:13
I did,still the error E: Unable to locate package gedit-gmate. – Arup Rakshit Apr 28 '13 at 7:17

This is not an elegant solution but it worked for me. Replace 'raring' with 'quantal' in the following file and try again:

sudo gedit /etc/apt/sources.list.d/ubuntu-on-rails-ppa-raring.list
sudo apt-get update
sudo apt-get install gedit-gmate
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