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Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by pmontra on Sunday January 29, 2017 @03:50AM (#13513114)
Yep, I had to fix a 14.04 server like that last week. /boot filled with old kernels and apt was falling. I had to manually fix that.

I also don't have swap on my laptop (16 GB RAM and SSD) and I rarely hit 10 GB of used space. With no swap I mean no swap partition. I'm getting those out of memory errors in Opera tabs since the new kernel. Luckily my primary browser (FF) is fine. I guess it's trying to swap Opera out even if there is no swap. I'll reboot with the older kernel and see what happens.

Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by beagle3 on Tuesday January 31, 2017 @10:24AM (#13531269)
Likely, opera asks for a disk-based anonymous memory mapping - this goes on the swapfile if you have one, and fails if you don't.