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2015-07-08 20:59:23 -0500 asked a question sudo apt-get update

I tried to update using the sudo apt-get update command in ubuntu 12.04 it gives me an error

E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)  
E: Unable to lock directory /var/lib/apt/lists/  
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)  
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

can anyone help me how to solve this problem??

2015-03-25 04:08:58 -0500 received badge  Popular Question (source)
2015-03-23 08:58:46 -0500 asked a question Ros Hydro on Ubuntu14.04

I am currently using a ubuntu 14.04 and I have bought the book "Ros By Example Hydro-Volume 1". Is there any possible ways for me to download Ros Hydro in my computer?? and even though in can't is the Ros indigo very different with hydro?? Is it okay to use the hydro book on the Ros indigo??

2015-03-23 08:58:46 -0500 asked a question I can't download the software in Ubuntu

I am currently using a ubuntu 14.04 and I have bought the book "Ros By Example Hydro-Volume 1". Is there any possible ways for me to download Ros Hydro in my computer?? and even though in can't is the Ros indigo very different with hydro?? Is it okay to use the hydro book on the Ros indigo??