how to view nfo files on RPi? Please help.

[raspjuan]

I have installed the nfoview on RPi,

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sudo apt-get install nfoview

however, it shows the following error message during the installation

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Setting up screen (4.1.0~20120320gitdb59704-7) ...
insserv: warning: script 'mathkernel' missing LSB tags and overrides
insserv: There is a loop between service minidlna and mathkernel if stopped
insserv:  loop involving service mathkernel at depth 2
insserv:  loop involving service minidlna at depth 1
insserv: Stopping mathkernel depends on minidlna and therefore on system facility `$all' which can not be true!
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header
dpkg: error processing screen (--configure):
 subprocess installed post-installation script returned error exit status 1
Setting up xfonts-terminus (4.35-1) ...
Setting up nfoview (1.9.2-1) ...
Processing triggers for python-support ...
Processing triggers for menu ...
Errors were encountered while processing:
 screen
E: Sub-process /usr/bin/dpkg returned an error code (1)

after the installation, when I use nfoview to view the nfo file, I received the following message:

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/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display
  warnings.warn(str(e), _gtk.Warning)
/usr/lib/pymodules/python2.7/nfoview/schemes.py:94: GtkWarning: IA__gtk_settings_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed
  _style = gtk.TextView().rc_get_style()
Segmentation fault

Please help me solve the problem. thanks