I installed Ubuntu on a new SSD in my desktop PC, then installed Bitcoin Core, downloaded the blockhain.
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This is good news, right? I've ordered a Ledger Nano.
Looks like you found your riches, good for you!
Now don't go online again with that disk installed. Once your hardware wallet arrives, and after you've made a few safe backups of the word phrases, create and sign your transaction offline, and broadcast the transaction from another system.
OK, I need to get my head around creating, signing and broadcasting. I only ever received one transaction in 2010 which was just a matter of giving someone my public address.
Yes I was dimly aware of forking - so not enough for the jet! But basically free money so I'm not complaining.
Note: I wasn't around in 2010, but chances are your old wallet has no spare addresses. That means, if you send a small transaction as a test, the change probably goes to a new and freshly created address. That also means all your other backups won't have access to those funds anymore. I'm not exactly sure how this will play out, but you should check it before doing it.
Right, will have to get my head around all that at some point then.
Thanks for your help!