I bought my Lenovo T520 back in 2011, and for a while I had no problems, but then I decided to install Windows 8, which was initially unsuccessful because I was using unofficial methods. I eventually managed it, although I am sure some of the files were missing or something like that.
Eventually I got curious about Ubuntu last year and gave it a try.
Now because (I think) of these files or drivers or whatnot missing, the update popup for 14.10 always would pop-up, and then ask for my password so it could go forward with the upgrade.
The upgrade was going fine, and I just locked my PC only to come back and being unable to do anything except look at the lock screen and wave my mouse around. I did a hard reset, and when I tried to go to Ubuntu from my GRUB menu,it gave me a weird message saying it was unable to mount my kernel.
The exact message is
unable to mount root fs on unknown-block(0,0)
Even the recovery wouldn't work, so I went to a previous version of Ubuntu, which lost a lot of the configurations I made on Ubuntu recently, but all my files are there. The problem is it won't even try to connect to wifi, and it's very slow.
It won't even shut down, it just lets me log out.
So after almost a full year I'm back on Windows having decided it'd be best to just do a factory reset. Unfortunately Windows is saying I have missing files which I'll need to provide through recovery media, which I don't have. Same with refresh.
Is there anyway to do a factory reset through Ubuntu, or a way to fix whatever mistake I made by doing the hard reset? Please try to keep the explanations basic.
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