Public bug reported:

The system-summary menu of friendly-recovery dies in many different
CPUs:

sh /lib/recovery-mode/options/system-summary 
cat: /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies: No 
such file or directory
/lib/recovery-mode/options/system-summary: 29: 
/lib/recovery-mode/options/system-summary: arithmetic expression: expecting 
primary: " / 1000"

I tested in 16.04 and in 17.04, with many different CPUs:
Intel(R) Core(TM) i5-4440 CPU @ 3.10GHz
AMD Phenom(tm) II X6 1090T Processor
Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz

On the other hand, that file did exist on the following CPUs:
Pentium(R) Dual-Core  CPU      E5300  @ 2.60GHz
Intel(R) Core(TM)2 Duo CPU     P8600  @ 2.40GHz

So the code needs to cope with that file possibly missing.

** Affects: friendly-recovery (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1675824

Title:
  system-summary fails due to missing file
  /sys/.../scaling_available_frequencies

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