Ubuntu 18.04 freezes when several applications are running, even keyboard is dead

Question

I'm running ubuntu 18.04 in an Aspire-M7811 desktop with a processor Intel® Core™ i5 CPU 650 @ 3.20GHz × 4. The case is that:when I open several aplications it freezes at all, even the keyboard is dead so I can only power down the pc.

Thanks for your help!

Answer 1

I think this is the same question which is being asked before : here is the link for the same,

What should I do when Ubuntu freezes?

maybe it will help you.