I'm a newbie on ubuntu and I don't know what happened on my os ubuntu 14.10 bc the nautilus file manager always closed when I try to change permission on file properties. I ran it as root in terminal. I wrote
sudo nautilus in terminal and it was running normally but when I try to change permission on a file, nautilus will suddenly closed and this error was appear in terminal:
ERROR:nautilus-properties-window.c:1840:schedule_owner_change_timeout: assertion failed: (NAUTILUS_IS_FILE (file))
Hope anyone can help me to fix this problem. Thanks!