Those are just warnings that your /etc/apt/sources.list and /etc/apt/sources.list.d/ have become slightly broken due to the use of PPAs. Unfortunately this is not a bug in regular Ubuntu so you will need to fix those errors yourself.
Those are just warnings that your /etc/apt/ sources. list and /etc/apt/ sources. list.d/ have become slightly broken due to the use of PPAs. Unfortunately this is not a bug in regular Ubuntu so you will need to fix those errors yourself.