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I'm trying to install software on Ubuntu but whenever I write the command at terminal (e.g. sudo apt-get install scalpel) it shows following error:

user@OCAC:~$ sudo apt-get install scalpel
[sudo] password for user: 
Reading package lists... Done
Building dependency tree
Reading state information... Done
N: Ignoring file 'trusty-stella-datong.volatile' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'trusty-stella-datong.volatile' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension

E: Unable to locate package scalpel

How can I solve this problem?

muru
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Lulu Tandi
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  • Answer to this question might help you. http://askubuntu.com/questions/378558/unable-to-locate-package-while-trying-to-install-packages-by-apt?lq=1 – Kulasangar May 21 '16 at 11:34
  • Make sure you have enabled the universe repository in your Software Sources, and then run sudo apt-get update – steeldriver May 21 '16 at 12:20

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