Similar to Bug 566686:
KDE4 Plasma PIM; Akregator:
The "worked for years" URL <https://news.opensuse.org/?feed=rss2> reports
"invalid XML".

When I subscribe to the RSS Feed a file is dropped into my /tmp/mozilla_??
directory; Akregator also reports that this file has "invalid XML".

If I edit the file in /tmp/mozilla_?? as follows:
1. Remove the white-space before "<?xml version="1.0" encoding="UTF-8"?>";
2. Place "<rss version="2.0" . . . " on a new line;
3. Join all the "<rss version="2.0" . . . " components into a single line;
4. Remove the white-space preceding the terminating ">" of the "<rss " line;

it works!