테마 애플리케이션은 Cinnamon에 설치된 GTK 테마(창 테두리 및 컨트롤)의 미리보기를 표시하지 않습니다.

답변이 늦었지만 여전히 유용하길 바랍니다. 이는 계피에 대한 테마 축소판이 제공되지 않기 때문에 발생할 가능성이 높습니다. 바라보다 /usr/share/cinnamon/thumbnails/gtk-3.0/README:

HOW TO MAKE A GTK THEME THUMBNAIL?
----------------------------------

- Install ImageMagick ("apt install imagemagick")
- Open a terminal and run "cinnamon-preview-gtk-theme mytheme" (where mytheme is the name of the Theme you want to thumbnail)
- Press Alt+Print-Screen to take a screenshot of the window
- Go to your Pictures directory and move the screenshot to ~/screenshot.png
- Open a terminal and type:

       cd
       convert screenshot.png -gravity north-west -extent 120x35 thumbnail.png

WHICH THUMBNAIL IS USED BY CINNAMON TO REPRESENT A THEME?
---------------------------------------------------------

- Cinnamon first tries to find a gtk-3.0/thumbnail.png file in the theme directory
- If it doesn't find any, it looks in /usr/share/cinnamon/thumbnails/gtk-3.0/

그리고 /usr/share/cinnamon/thumbnails/metacity-1/README:

HOW TO MAKE A METACITY THUMBNAIL?
---------------------------------

- Install ImageMagick ("apt install imagemagick")
- Open a window (Nemo for instance)
- Press Alt+Print-Screen to take a screenshot of the window
- Go to your Pictures directory and move the screenshot to ~/screenshot.png
- Open a terminal and type:

       cd
       convert screenshot.png -gravity north-east -extent 100x32 thumbnail.png

WHICH THUMBNAIL IS USED BY CINNAMON TO REPRESENT A THEME?
---------------------------------------------------------

- Cinnamon first tries to find a metacity-1/thumbnail.png file in the theme directory
- If it doesn't find any, it looks in /usr/share/cinnamon/thumbnails/metacity-1/