In my test VM:
root@ubuntu:~# ls -l /usr/share/backgrounds/warty-final-ubuntu.png -rw-r--r-- 1 root root 231208 2011-03-23 18:34 /usr/share/backgrounds/warty-final-ubuntu.png root@ubuntu:~# ls -l /home/stgraber/.cache/wallpaper/zoom_1024_768__usr_share_backgrounds_warty-final-ubuntu.png -rw-r--r-- 1 stgraber stgraber 327146 2011-04-18 18:10 /home/stgraber/.cache/wallpaper/zoom_1024_768__usr_share_backgrounds_warty-final-ubuntu.png root@ubuntu:~# ls -l /home/stgraber1/.cache/wallpaper/zoom_1024_768__usr_share_backgrounds_warty-final-ubuntu.png -rw-r--r-- 1 stgraber1 stgraber1 194801 2011-04-18 19:21 /home/stgraber1/.cache/wallpaper/zoom_1024_768__usr_share_backgrounds_warty-final-ubuntu.png
In my test VM:
root@ubuntu:~# ls -l /usr/share/ backgrounds/ warty-final- ubuntu. png backgrounds/ warty-final- ubuntu. png .cache/ wallpaper/ zoom_1024_ 768__usr_ share_backgroun ds_warty- final-ubuntu. png .cache/ wallpaper/ zoom_1024_ 768__usr_ share_backgroun ds_warty- final-ubuntu. png /.cache/ wallpaper/ zoom_1024_ 768__usr_ share_backgroun ds_warty- final-ubuntu. png /.cache/ wallpaper/ zoom_1024_ 768__usr_ share_backgroun ds_warty- final-ubuntu. png
-rw-r--r-- 1 root root 231208 2011-03-23 18:34 /usr/share/
root@ubuntu:~# ls -l /home/stgraber/
-rw-r--r-- 1 stgraber stgraber 327146 2011-04-18 18:10 /home/stgraber/
root@ubuntu:~# ls -l /home/stgraber1
-rw-r--r-- 1 stgraber1 stgraber1 194801 2011-04-18 19:21 /home/stgraber1