my problem solved.
I think google chrome cause this freezing and I Untick "use hardware
acceleration when available" , Disable "GPU Rasterization".
after that my system did not freeze
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Public bug reported:
I had installed Ubuntu 17.10 on a spare partition and updating it daily
my system freezes frequently It does not respond to any key presses like Ctrl
Alt F1 or Ctrl Alt Del.
My Leptop is Lenovo-E530 which has Intel Core i5 chip. Memory is 8GB and 2048
MB swap partition.
Pr