I'm running kubuntu 16.04 i386 and have just installed additional RAM. It seems that 16.04 doesn't have pae kernel:
E: Unable to locate package linux-generic-pae E: Unable to locate package linux-headers-generic-pae However MemTotal sees my memory:
~$ grep MemTotal /proc/meminfo MemTotal: 8219532 kB But KDE acts strange showing that I have 4 GB in System Information and a strange memory picture that makes me suspicious:
So how can I find whether Ubuntu uses additional memory or not?
Upd: Okay, I've managed to enable PAE, but the picture is the same.
Upd2: I used the program stress to test the memory usage. As far as I understand, command
stress --vm-bytes 300M --vm-keep -m 20 creates 20 workers each consuming 300 Mb of RAM via constant maaloc/free. So I have consumed 300x20 = 6000 Mb. It has slowed my PC creating the following picture: screenshot1
Thus my 8 Gb in KDE are 4 Gb of RAM + 4 GB of swap. I tried to disable swap
sudo swapoff -a The behaviour becomes weird, plasma crashes: screenshot2
I don't know what does it mean.
Upd3: So I installed 64-bit Ubuntu, everything is fine, here is a screenshot showing correct behaviour (click to enlarge): 
1 Answer
You should install Kubuntu 16.04 LTS 64-Bit.
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