To completely uninstall what came from a ppa + revert back to initial official packages + remove such ppa :
sudo ppa-purge ppa:t-tujikawa/ppa
This ppa has nothing available for your version of ubuntu, as can be seen here :
https://launchpad.net/~t-tujikawa/+archive/ubuntu/ppa
…last update was in 2013
Do you use other ppa ?
cat /etc/apt/sources.list.d/*
What is the actual state of your « global » sources.list :
cat /etc/apt/sources.list