I've made a great mistake.
I was trying to burn an iso image onto a usb stick with dd. I chose
sda8 which appeared to be my USB stick and I ran the command with
Now everything has gone mad and I cannot boot into Ubuntu or Windows that I had installed along it.
When I start my laptop now, it just says:
error: unknown filesystem.
I have very important data on my drive and I am going crazy at the moment.
Can somebody please help me. I would appreciate it immensely.