Yes, there is. To install it, you first have to first enable the SIL “experimental” repository. In a terminal:
sudo apt-add-repository "deb http://packages.sil.org/ubuntu/ $(lsb_release -sc)-experimental main"
sudo apt-get update
(Note the ‘apt-add-repository’ line is long and may appear as 2 lines, but copy-paste it as one line.) After this you should see Paratext 7.6 available, and once installed, you should get updates along with your other software updates.
Let me know if you would like more details.
~Cory