Take LVM snapshot before ubuntu upgrade

Ubuntu upgrade can be a challenge Ubuntu 18 is coming up in a few months. I started using Ubuntu on my machine since version 9.10 and it has gone through 8 upgrades. I’m running 17.10 now. If memory serves me right, my system crashed 2-3 times during these upgrades. In fact, those were the only downtime I have on this machine. In the early days, upgrade isn’t very mature IMO.…

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