I installed the wallet on Ubuntu and opened it, and sent the required amount of bitcoin from my Jaxx wallet to the address given by the transition bot. The bitcoin transaction never confirmed. Is there a problem sending from a Jaxx wallet? How do I do it from an electrum wallet since there are multiple bitcoin addresses? Do I need to sign the transaction?
If you can sign a message with your wallet then you don't need to send any transactions.
What is required is to get your byteball address from byteball wallet (the bot will instruct you)
Then enter your bitcoin address into byteball wallet
then copy your byteball address without quotes into your BTC wallet
Sign the pasted byteball address with your btc wallet.
Copy signature from btc wallet and paste into byteball wallet.
This should be confirmed in few minutes.
then you could check here if it is confirmed:
http://transition.byteball.org/