As the title, is there any way to automatically identify and remove ppa residual of previous release? I have upgraded to Ubuntu 14.04 from 13.04 and my /etc/apt/sources.list.d directory contains a lot of raring ppa.
E.g.
-rw-r--r-- 1 root root 248 set 8 12:10 jd-team-jdownloader-raring.list
-rw-r--r-- 1 root root 248 apr 26 21:12 jd-team-jdownloader-raring.list.distUpgrade
-rw-r--r-- 1 root root 248 set 8 12:10 jd-team-jdownloader-raring.list.save