My Sherline Linux CNC Ubuntu PC won't start

  'm running Sherline CNC with their PC with I believe Ubuntu. What can I do here? I'm not familiar with Linux but there was no sign that something bad with SSD before. Ive got such experience with dying SSD on MacBook but it showed a clear error in the begging so I could copy the file system and remount it on a new SSD. I've got install CD but can't figure out what's wrong
 

Hi, thanks for the reply. I've got an install CD with Ubuntu 12.04. When I'm able to proceed to loading screen its says Linux 3.4-9-rtai-686-pae. I also noticed that time was off and changed time. I guess I need to change the battery as well. Now it shows error:
buffer I/0 error on device sda3. Ive ordered a new SSD but have no idea how to copy my old disk

Thanks, I was able to load from my install CD. It says Ubuntu 12.04. Same in config description. I use this PC to run Linux CNC for my Sherline CNC mill and lathe. It's being used only for this. I run the disk utility to check the SSD and it found no errors. What it can be then? Anyway I've ordered a new SSD. Now I need to understand how to make an image of my system to transfer it to new SSD. Could you please assist here? On my MacBook I always use Time machine and have no problem.

If you think you're SSD is dying cloning may not be an option,

Best option would be to boot from a CD mount the partition your home directory is on and copying that to a usb drive.

Having not used such a early version of Ubuntu in ages, and noticing that dev-mapper is loading, do you have any LLVM partions is this a dual boot system? Or rather how are the partitions setup ? If you boot into a lice session via CDwill display the partition layout.

First place I would have started was searching for the text via google in the second last message in the picture. This particular error seemed to have a habit of popping up with no prior warning or sometimes errors that have been ignored. Also I would search for the line beginning with "error: unexpectedly disconnected from boot status daemon"