Novadays it is very hard to study with an unstable computer.
I had my laptop for about 5 years and a year ago I installed Ubuntu alongside Windows (which I never used). I had no problems for about a year, but two weeks ago my computer boot to initramfs.
Simple solutions like "just type 'fsck /dev/sda1' " didn't work so first time I reinstall Ubuntu (and deleted Windows). But after a few days the problem came back. So, I learned, how to fix problem with live CD (based on the first answer of this question). But the problem appears again and again after about 3 days.
Today I couldn't boot Ubuntu.
So, my question is: "What can cause Ubuntu to boot in initramfs so often? How can I avoid surprises again?"