There are two wallets:
wallet #1 (savings wallet on USB drive that I created following the steps here: http://startbitcoin.com/how-to-create-a-secure-bitcoin-wallet/
wallet #2 that came with bitcoin client.
A couple of months ago, I sent some bitcoins to my #1 wallet address, and and now I wanted to update it. I just booted Ubuntu from USB drive and installed Bitcoin Linux version.
When I opened Bitcoin, I first tried to delete wallet #2 that came in .bitcoin folder in order to paste my #1 wallet from USB stick.
For some reason, I was not able to delete wallet #2, or paste my savings wallet.
Also, when I tried to open wallet #2, I got the message:Could not display “/home/ubuntu/.bitcoin/wallet.dat”
The file is of an unknown type.
When I first went through this process a few months ago, everything went well. This time, I am making a mistake somewhere.