The error message clearly states that the following:
'E:Malformed line 57 in source list /etc/apt/sources.list (dist parse)'
This means that line 57 in /etc/apt/sources.list is improperly formatted. This is likely due to the modification you made to add skype. If you were to attach the file to this bug report we could help you sort out the issue. Alternatively, you could just delete line 57 and not install skype from the partner archive.
The error message clearly states that the following:
'E:Malformed line 57 in source list /etc/apt/ sources. list (dist parse)'
This means that line 57 in /etc/apt/ sources. list is improperly formatted. This is likely due to the modification you made to add skype. If you were to attach the file to this bug report we could help you sort out the issue. Alternatively, you could just delete line 57 and not install skype from the partner archive.