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https://shakaran.net/blog/2010/08/solucionar-error-n-ignoring-file-somefile-list-save-in-directory-etcaptsources-list-d-as-it-has-an-invalid-filename-extension-en-ubuntu-maverick-10-10/
Solucionar error: N: Ignoring file 'somefile.list.save' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension en Ubuntu Maverick 10.10