ppa:yacoin/yacoin
sudo apt-add-repository ppa:yacoin/yacoin
sudo apt-get update
sudo apt-get install yacoin-qt
sudo apt-get install yacoind
** Warning to all current Ubuntu Yacoin users
This repository uses LibDB 4.8 from the Bitcoin PPA to compile the binaries and uses it to open the wallet database.
Your own github source compiled yacoin-qt might have created a wallet with libDB 5.1. In that case the wallet will not open with this version.
If you migrate to using this PPA Yacoin client, you need to create a new wallet and use the old client to send your YACs to the new wallet.
(or you can dumpprivkey and importprivkey if you know how)
Backup your wallet.dat before trying any new software
cp ~/.yacoin/wallet.dat ~/.yacoin/wallet.dat.bak