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Whenever I try to install some software or plugin or codec, i'm often getting this problem : 

Ignoring file 'mono-xamarin.lit' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension

Please help me with a solution.

Kannan Mani
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    In addition to the answer you were given, heres a short explanation. Files that belong in sources.list.d/ have to end with the file extension .list. More information can be found here. http://askubuntu.com/questions/82825/do-files-at-etc-apt-sources-list-d-need-to-have-an-extension-list –  Jun 09 '16 at 15:35

1 Answers1

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The solution is easy for you to achieve, rename the file in question to be a proper file or remove it. To rename it you can do the following command:

sudo mv /etc/apt/sources.list.d/mono-xamarin.lit /etc/apt/sources.list.d/mono-xamarin.list

Or for removing it

sudo rm /etc/apt/sources.list.d/mono-xamarin.lit
Videonauth
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