I had ubuntu 14.04. tried upgrading to 15.04. all the files were downloaded and the upgrade process was started. some error messages showed up during installation but the upgrade process was finished. after that I tried restarting my computer, but clicking on restart or shutdown buttons didn't worked for me, so I turned off the computer by holding down the power button. but after turning it on again It didn't boot up and showed me the "Kernel Panic" problem. I tried booting up ubuntu in recovery mode with GRUB menu, but again the "kernel panic" problem.
As I'm posting this question, I'm using the ubuntu 14.04 live CD. I found that I can reinstall ubuntu without losing my files, but because I had upgraded to ubuntu 15.04, I can't use this option. it only allows me to install ubuntu 14.04 alongside ubuntu 15.04. if I do this, will I be able to access my old files and documents?
I currently managed to copy my
/var/www folder from my internal
996 GB volume to my
external hard drive, but it doesn't allow me to copy my documents, music, pictures which are stored in my
/home directory. it says I have no permission.
can I use terminal to change the permission of the folders in
/home and copy them?