No, this is most definitely not:
- copy the private key+public key into a excel or something to print them, just in case. + encrypt the file and put on usb stick
- make copy of wallet.dat (where can i find this in ubuntu? never used it b4) + encrypt the file and put on usb stick
Having wallet.dat on a USB stick and unencrypted isn't a good idea. Having keys in Excel and on loose sheets of paper under the keyboard is even worse.
The Live CD is going to help you get around keyloggers, but the way you're making it, it just opens a new security hole. Get an antivirus or use something like Trezor.