今天我在我的机器上安装了 Xubuntu 14.04。我设置了一些程序和不同的工具。
但是当我右键单击文件时，在“打开方式”行中我看到一个空单元格：
当我单击它时，会出现一个十字鼠标指针，我可以将其拖动到屏幕上。要返回默认鼠标，我双击窗口。
然后 PostScript 图像就会出现在我的主文件夹中 (截图在这里）。这些图像就像是我点击空白行时的视图截图。
如何解决？我可以删除“打开方式”选项中的空白行吗？
编辑：
正如建议的那样，这是输出grep -r 'text/x-python' ~/.local/share/applications：
/home/tree/.local/share/applications/userapp-atom_loader.py-8NH4XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-2Y34XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-python-H5O7XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-%f-MEQYXX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-%f-5U2UXX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-M739XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-l.sh-SA27XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-l.sh-EJT5XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-dj-py.py-VM06XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-python-VGY5XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-KVDDYX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-ip.py-XFIWXX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-python atom_loader.py-O0W4XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-sudo reboot-FDOUXX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/mimeapps.list:text/x-python=menulibre-sublime-text-2.desktop;
/home/tree/.local/share/applications/userapp-atom_loader.py-6UNFYX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-%f-7ZQCYX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-J8IFYX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-%f-MO9EYX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-ip.py-UYFVXX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-l.sh-MR2UXX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-dj-py.py-YAR4XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-python-5XZ4XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/userapp-atom-9Y73XX.desktop:MimeType=text/x-python
/home/tree/.local/share/applications/mimeinfo.cache:text/x-python=userapp-python atom_loader.py-HABUXX.desktop;userapp-atom-9Y73XX.desktop;userapp-python-5XZ4XX.desktop;userapp-dj-py.py-YAR4XX.desktop;userapp-atom-l.sh-MR2UXX.desktop;userapp-ip.py-UYFVXX.desktop;userapp-%f-MO9EYX.desktop;userapp-atom-J8IFYX.desktop;userapp-%f-7ZQCYX.desktop;userapp-atom_loader.py-6UNFYX.desktop;userapp-sudo reboot-FDOUXX.desktop;userapp-python atom_loader.py-O0W4XX.desktop;userapp-ip.py-XFIWXX.desktop;userapp-atom-KVDDYX.desktop;userapp-python-VGY5XX.desktop;userapp-dj-py.py-VM06XX.desktop;userapp-atom-l.sh-EJT5XX.desktop;userapp-atom-l.sh-SA27XX.desktop;userapp-atom-M739XX.desktop;userapp-%f-5U2UXX.desktop;userapp-%f-MEQYXX.desktop;userapp-python-H5O7XX.desktop;userapp-atom-2Y34XX.desktop;userapp-atom_loader.py-8NH4XX.desktop;
/home/tree/.local/share/applications/userapp-python atom_loader.py-HABUXX.desktop:MimeType=text/x-python
这是输出mimetype dj-py.py：
dj-py.py: text/x-python
没有输出grep -r 'text/x-python' /usr/share/applications