Everything was working alright until just two days ago when I decided to set the default brightness level using the instructions in https://askubuntu.com/questions/66751/how-do-i-set-default-display-brightness and later installing xSwipe touchpad driver following the instructions in http://www.elementarynow.com/multitouch-trackpads-luna/

No problems occurred on reboot after setting the default brightness level. However, as I installed XSwipe and reached the reboot stage according to the instructions in the webpage above, my laptop loaded with black screen and no GUI for awhile. I reboot and pressed Alt+F1 to look at the code interface. The first line of the code interface wrote

Error "[drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun" 

When I switch back to the GUI with the 'E' logo, it showed “Disk drive for dev/mapper/cryptswap 1 is not ready yet or not present”

I am still able to use my laptop via the GUI of a live USB stick but cannot access files in home directory. I want to retrieve my files and data first before doing anything as I have dissertation work on this laptop. I can't seem to move or copy files because the chmod command says I am not allowed to do so even though I have already set terminal to root privileges.

  • It would be very useful if you post which Elementary OS version are you using and the output of the following command in a live USB system running in your laptop. sudo lvdisplay – Mauricio López Jun 17 '15 at 13:31
  • @MauricioLópez I am using elementary OS Freya 3.0 The output for sudo lvdisplay is: No volume groups found – Liew Shan Berg Jun 17 '15 at 13:38

Elementary OS is Ubuntu based so this how-to should work (check the Recovering from a LiveCD section.)

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