Cannot boot because: Kernel panic - not syncing: Attempted to kill init!
There you go /sbin/init: No such file or directory. Looks like it can't find a /sbin/init on /dev/sda6.
Maybe have a look from a Live CD, and see what is on sda6? Is it the right partition? Is just that file missing?
You can probably fix it from a Live CD, but I'm not sure what caused it, so I can't give instructions. Reinstalling is probably easier, if you don't know how to fix it, yourself.
I had a lot of trouble with that same exact problem and it took me a while but i managed to fix my problem with the following solution. I installed Boot repair and repaired my file system. I have LVM(logical volume mangement) and i couldnt run fsck. you can follow how to install it from https://help.ubuntu.com/community/Boot-Repair or
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo sed 's/trusty/saucy/g' -i /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list
sudo apt-get update
sudo apt-get install -y boot-repair && (boot-repair &)
after that, boot-repair should open automatically
- click the "advanced options" to expand
- in the "Main options" tab, check "Reinstall GRUB" and "Repair file systems" Repairing file systems is the most important part as the kernel panics happen because of some file system error.
- int the "Grub options" tab, check "Purge GRUB before reinstalling it"
- and of course you must have internet connection as you will be installing new files. and finally click Apply.
From my experience, I think that this problem is caused by upgrading to a newer kernel version.
Force shutdown and then power on again. Select the Advance option for Ubuntu or Elementary. In the next tab, just choose a previous kernel version and hit Enter and it will go to desktop normally.