Same problem on Ubuntu MATE 16.04.1 - the sensors page is blank.
Some interesting output from "strace hwinfo" when I select the sensors tab:

access("/sys/class/hwmon/hwmon0/device/", F_OK) = -1 ENOENT (No such file or 
directory)
access("/proc/acpi/thermal_zone", F_OK) = -1 ENOENT (No such file or directory)
open("/proc/omnibook/temperature", O_RDONLY) = -1 ENOENT (No such file or 
directory)


Note that while /sys/class/hwmon/hwmon0/device/ does not exist on my PC, 
/sys/class/hwmon/hwmon1/device/ and /sys/class/hwmon/hwmon2/device/ do exist.

$ ls  /sys/class/hwmon/hwmon0/
name  power  subsystem  temp1_crit  temp1_input  temp2_crit  temp2_input  uevent

$ ls  /sys/class/hwmon/hwmon1/
device  power      temp1_crit        temp1_input  temp1_max   temp2_crit_alarm  
temp2_label  temp3_crit        temp3_input  temp3_max   temp4_crit_alarm  
temp4_label  temp5_crit        temp5_input  temp5_max
name    subsystem  temp1_crit_alarm  temp1_label  temp2_crit  temp2_input       
temp2_max    temp3_crit_alarm  temp3_label  temp4_crit  temp4_input       
temp4_max    temp5_crit_alarm  temp5_label  uevent

$ ls  /sys/class/hwmon/hwmon2/
beep_enable     fan4_target     in12_min    in4_input  intrusion0_alarm         
 pwm1_weight_duty_base       pwm2_weight_duty_base       pwm3_weight_duty_base  
     pwm4_weight_duty_base       pwm5_weight_duty_base       temp3_type
device          fan4_tolerance  in13_alarm  in4_max    intrusion0_beep          
 pwm1_weight_duty_step       pwm2_weight_duty_step       pwm3_weight_duty_step  
     pwm4_weight_duty_step       pwm5_weight_duty_step       temp4_input
fan1_alarm      fan5_alarm      in13_beep   in4_min    intrusion1_alarm         
 pwm1_weight_temp_sel        pwm2_weight_temp_sel        pwm3_weight_temp_sel   
     pwm4_weight_temp_sel        pwm5_weight_temp_sel        temp4_label
fan1_beep       fan5_beep       in13_input  in5_alarm  intrusion1_beep          
 pwm1_weight_temp_step       pwm2_weight_temp_step       pwm3_weight_temp_step  
     pwm4_weight_temp_step       pwm5_weight_temp_step       temp4_offset
fan1_input      fan5_input      in13_max    in5_beep   name                     
 pwm1_weight_temp_step_base  pwm2_weight_temp_step_base  
pwm3_weight_temp_step_base  pwm4_weight_temp_step_base  
pwm5_weight_temp_step_base  temp4_type
fan1_min        fan5_min        in13_min    in5_input  power                    
 pwm1_weight_temp_step_tol   pwm2_weight_temp_step_tol   
pwm3_weight_temp_step_tol   pwm4_weight_temp_step_tol   
pwm5_weight_temp_step_tol   temp5_input
fan1_pulses     fan5_pulses     in14_alarm  in5_max    pwm1                     
 pwm2                        pwm3                        pwm4                   
     pwm5                        subsystem                   temp5_label
fan1_target     fan5_target     in14_beep   in5_min    pwm1_auto_point1_pwm     
 pwm2_auto_point1_pwm        pwm3_auto_point1_pwm        pwm4_auto_point1_pwm   
     pwm5_auto_point1_pwm        temp10_input                temp5_offset
fan1_tolerance  fan5_tolerance  in14_input  in6_alarm  pwm1_auto_point1_temp    
 pwm2_auto_point1_temp       pwm3_auto_point1_temp       pwm4_auto_point1_temp  
     pwm5_auto_point1_temp       temp10_label                temp5_type
fan2_alarm      in0_alarm       in14_max    in6_beep   pwm1_auto_point2_pwm     
 pwm2_auto_point2_pwm        pwm3_auto_point2_pwm        pwm4_auto_point2_pwm   
     pwm5_auto_point2_pwm        temp1_alarm                 temp6_input
fan2_beep       in0_beep        in14_min    in6_input  pwm1_auto_point2_temp    
 pwm2_auto_point2_temp       pwm3_auto_point2_temp       pwm4_auto_point2_temp  
     pwm5_auto_point2_temp       temp1_beep                  temp6_label
fan2_input      in0_input       in1_alarm   in6_max    pwm1_auto_point3_pwm     
 pwm2_auto_point3_pwm        pwm3_auto_point3_pwm        pwm4_auto_point3_pwm   
     pwm5_auto_point3_pwm        temp1_input                 temp6_offset
fan2_min        in0_max         in1_beep    in6_min    pwm1_auto_point3_temp    
 pwm2_auto_point3_temp       pwm3_auto_point3_temp       pwm4_auto_point3_temp  
     pwm5_auto_point3_temp       temp1_label                 temp6_type
fan2_pulses     in0_min         in1_input   in7_alarm  pwm1_auto_point4_pwm     
 pwm2_auto_point4_pwm        pwm3_auto_point4_pwm        pwm4_auto_point4_pwm   
     pwm5_auto_point4_pwm        temp1_max                   temp7_input
fan2_target     in10_alarm      in1_max     in7_beep   pwm1_auto_point4_temp    
 pwm2_auto_point4_temp       pwm3_auto_point4_temp       pwm4_auto_point4_temp  
     pwm5_auto_point4_temp       temp1_max_hyst              temp7_label
fan2_tolerance  in10_beep       in1_min     in7_input  pwm1_auto_point5_pwm     
 pwm2_auto_point5_pwm        pwm3_auto_point5_pwm        pwm4_auto_point5_pwm   
     pwm5_auto_point5_pwm        temp1_offset                temp8_input
fan3_alarm      in10_input      in2_alarm   in7_max    pwm1_auto_point5_temp    
 pwm2_auto_point5_temp       pwm3_auto_point5_temp       pwm4_auto_point5_temp  
     pwm5_auto_point5_temp       temp1_type                  temp8_label
fan3_beep       in10_max        in2_beep    in7_min    pwm1_crit_temp_tolerance 
 pwm2_crit_temp_tolerance    pwm3_crit_temp_tolerance    
pwm4_crit_temp_tolerance    pwm5_crit_temp_tolerance    temp2_alarm             
    temp9_input
fan3_input      in10_min        in2_input   in8_alarm  pwm1_enable              
 pwm2_enable                 pwm3_enable                 pwm4_enable            
     pwm5_enable                 temp2_beep                  temp9_label
fan3_min        in11_alarm      in2_max     in8_beep   pwm1_floor               
 pwm2_floor                  pwm3_floor                  pwm4_floor             
     pwm5_floor                  temp2_input                 uevent
fan3_pulses     in11_beep       in2_min     in8_input  pwm1_mode                
 pwm2_mode                   pwm3_mode                   pwm4_mode              
     pwm5_mode                   temp2_label
fan3_target     in11_input      in3_alarm   in8_max    pwm1_start               
 pwm2_start                  pwm3_start                  pwm4_start             
     pwm5_start                  temp2_max
fan3_tolerance  in11_max        in3_beep    in8_min    pwm1_step_down_time      
 pwm2_step_down_time         pwm3_step_down_time         pwm4_step_down_time    
     pwm5_step_down_time         temp2_max_hyst
fan4_alarm      in11_min        in3_input   in9_alarm  pwm1_step_up_time        
 pwm2_step_up_time           pwm3_step_up_time           pwm4_step_up_time      
     pwm5_step_up_time           temp2_offset
fan4_beep       in12_alarm      in3_max     in9_beep   pwm1_stop_time           
 pwm2_stop_time              pwm3_stop_time              pwm4_stop_time         
     pwm5_stop_time              temp2_type
fan4_input      in12_beep       in3_min     in9_input  pwm1_target_temp         
 pwm2_target_temp            pwm3_target_temp            pwm4_target_temp       
     pwm5_target_temp            temp3_input
fan4_min        in12_input      in4_alarm   in9_max    pwm1_temp_sel            
 pwm2_temp_sel               pwm3_temp_sel               pwm4_temp_sel          
     pwm5_temp_sel               temp3_label
fan4_pulses     in12_max        in4_beep    in9_min    pwm1_temp_tolerance      
 pwm2_temp_tolerance         pwm3_temp_tolerance         pwm4_temp_tolerance    
     pwm5_temp_tolerance         temp3_offset

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https://bugs.launchpad.net/bugs/1393055

Title:
  HardInfo sensors page is blank

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