The following information may help to resolve the situation:

The following packages have unmet dependencies:
 skype : Depends: skype-bin
N: Ignoring file 'trillian.list.2' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'trillian.list.1' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'trillian.list.2' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'trillian.list.1' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
E: Unable to correct problems, you have held broken packages.
sonny@sonny-Presario-CQ57-Notebook-PC:~$