This is a trivial error, so might be added for beginners to fix. Also reported to Ubuntu as "Value in glitchpeg.desktop, "Comment", divided into two lines" #1940981.
"The value of the key "Comment" in /usr/share/applications/screensavers/glitchpeg.desktop is divided into two lines, like this: Comment=Loads an image, corrupts it, and then displays the corrupted version, several times a second. After a while, finds a new image to corrupt. Written by Jamie Zawinski; 2018. It should be one single line, without a line break after "version,", or there will be an error report when installing the desktop file." Yours, Anders Jackson