도크에서 "파일"(노틸러스)을 열 수 없습니다.

우분투 그놈(Ubuntu Gnome)을 처음 사용해 보세요! 어떤 이유로 "파일"(노틸러스?)이 더 이상 도크에서 열리지 않습니다. "파일"을 클릭해도 아무 일도 일어나지 않습니다.

그러나 nautilus .터미널에서 실행하면 다음 메시지가 나타납니다.

(nautilus:12419): Gtk-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Initializing nautilus-dropbox 2.10.0
Nautilus-Share-Message: Called "net usershare info" but it failed: Failed to execute child process "net" (No such file or directory)
Error loading document: Error opening file: Permission denied

(nautilus:12419): GnomeDesktop-WARNING **: Unable to create loader for mime type application/pdf: Unrecognized image file format

(nautilus:12419): GnomeDesktop-WARNING **: Error creating thumbnail for file:///usr/bin/fix-qdf: Unrecognized image file format
^[[Aroot@JW-UBUNTU:/usr/bin# nautilus .

(nautilus:12445): Gtk-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Initializing nautilus-dropbox 2.10.0
Nautilus-Share-Message: Called "net usershare info" but it failed: Failed to execute child process "net" (No such file or directory)

불행히도 이것은 현재 내 요구 사항을 약간 벗어나는 것입니다. 누구든지 이것을 설명할 수 있나요?