mkdesktop script has a syntax error in the dialog to select desktop environment, specifically from the parentheses in “Awesome (Tiling Window Manager)”. Removing the parentheses is the trivial fix. https://github.com/bourne-again/mkdesktop/blob/master/mkdesktop#L384
(In reply to Joseph Anthony Pasquale Holsten from comment #0) Or you can use single quotes around "Awesome (Tiling Window Manager)”. And increase 30 to 50 in https://github.com/bourne-again/mkdesktop/blob/master/mkdesktop#L378 (width of dialog, 30 is too small for "Awesome (Tiling Window Manager)”).