New answers tagged downgrade
Yes, you can switch to 3.13 kernel easily. Install 3.13 kernel by running sudo apt-get install linux-generic Remove all linux-headers and linux-image packages of 3.19 version using synaptic. This will also remove 3.19 meta packages.
It's a risky thing to try a rollback, there's no easy way to downgrade. Best option: After backing up your stuff, re-install the OS. As user1362567 said on another question " First generate a list of what you have installed on your system. You can do this by typing the following in the terminal. sudo dpkg --get-selections | grep '[[:space:]]install$' ...
Did you check if your BIOS boot order includes your /dev/sda disk? If it does, you may try to fix GRUB bootloader using a live cd. The easiest way is using Super Grub2 or Rescatux. Advanced users would go with SystemRescueCD following this guide: http://www.sysresccd.org/Sysresccd-Partitioning-EN-Repairing-a-damaged-Grub
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