Same issue here on a new 16.04 install on a new HP laptop. SSD. It was
crashing randomly during the install, then when I got it installed it
crashed every time I tried to run the updater.
Setting the vm.dirty_ratio and vm.dirty_background_ratio to 10 and 5
worked for me as well so far.
I did notice one interesting thing, which I feel might help diagnose
what's going on behind the scenes. When I was having the problem, the
CPU temp would get pretty high (up to 70 C) and the fan on the laptop
was running very loudly. These symptoms happened every time. The mouse
became slower, and slower, and unresponsive. Ctrl-Alt-F1 and other
keyboard shortcuts were unresponsive as well.
After changing those vm values, I was able to go through the updater
with no issue. And my CPU temp was about 10 C lower, hovering around 60
during the updater. The cooling fan did not go on high either. So
somehow the higher vm.dirty values are creating a situation where the
CPU is working much harder than it needs to for the job it's trying to
do.
I don't know nearly enough about the inner workings of linux to know
what this means, but my instincts tell me it might be an important clue
for anyone trying to fix this bug. Hopefully it helps.
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https://bugs.launchpad.net/bugs/1208993
Title:
Ubuntu slows down and hangs while copying file from/to USB
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