Back in 2010 (or 2011) I bought (or purchased) a BitCoins. I don't remember anymore from where and from whom I bought it and how much I paid for it ...
I see threads like this a lot lately, but usually it turns out they bought the Bitcoins later than they thought. If it's really 2010-2011, you could have turned every dollar you spent into a million dollars now.
I have one old PC which is disconnected from internet with "Ubuntu 16.04" on the USB drive and I start it from USB and I want to connect and to check all my old IDE HD drives that I have but I don't know what should I look for and how should I do it with in "Ubuntu" ? I have no "Windows machine" to try it in "Windows"...
I read something about "private keys" and "wallet.dat" files and some "...52 long characters of something..." or something what I don't understand what is this...
Could someone help me with that to find out if I still have those BitCoins somewhere on some of my old IDE HDD's ? Where shoul I begin and what are the steps... ?
Go through the files, search for a wallet or anything that looks like it. It could even be a text-file. When you find it, before doing anything else, create a backup on a USB-stick. Then, create another backup!
Keep your wallet offline, don't copy it to an online computer, until you've figured out what to do with it. Good luck treasure hunting!
Best chance is to use a hard drive recovery software -- a common win7 used one is Recuva
You don't need to recover anything when it hasn't been deleted.