I've had Ubuntu 11.10 with 220.127.116.11 kernel working but sound was off, so I was using 18.104.22.168 which started having some problems. So, I decided to upgrade kernel to 3.1. Upgrade went perfectly (no error messages) but after reboot there is a violet screen.
I turn the computer on and I have GRUB properly working, I choose 3.1 version and I get the violet screen or there is logo with dots, they turn all red, logo dissapears and I get the violet screen agan.
ctrl+alt+fdoesn't work, the same with the power button.
I tried choosing an older kernel version, I get black screen with some things turning on, everything is ok, and it stops (no log in screen) I can press power button and it works, and turns computer off.
I made a live CD on a pen drive but it gives a "boot error".
I went to recovery mode and tried
startx(gives a black screen with a locked mouse)
initx(white terminal window in the corner in which I can't write anything).
I don't now what I wrote but it gave something about Xorg problems. I also got i915 symbol problem (which I think I've seen before with working system I have Intel i5 and I've read it always gives it when there is no other graphics card on). I found a lot of similar problems but most of them was either to update, or nVidia problems – I have Radeon HD 5650
apt-get install --reinstall linux-image-generic
it went without problems, but showed me that I have 22.214.171.124 kernel version.
What to do to boot into Ubuntu?