That's because what I instructed in #15 makes laptop-mode-tools
ineffective to USB hotplug events. Not something that a user would want.

As I see from the reports, this is what I think is happening.

1) Users have some combination of usb devices, getting hotplugged upon 
discovery.
2) Step 1 results in early invocation of LMT.
3) Which further results in file systems getting ro mounted. This step is still 
erratic and I have no clue what the calling parent is, to this ro mount.

For users who've confirmed that #15 in the workaround works.
Can you please apply the workaround, successfully boot, then change back the 
changes to its original, and then hotplug a USB device ?
This will trigger the same chain of events, just that they'll be triggered upon 
full boot. Which should give us some insight into what may actually be behaving 
erratic.

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https://bugs.launchpad.net/bugs/1726930

Title:
  System fails to start (boot) on battery due to read-only root file-
  system

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