Download the following 2 files onto your computer and put them in one directory
jedit_4.3~pre18.dfsg-0ubuntu1~blueyedppa1_all.deb
lazy8ledger_2.24-0ubuntu1~thomas-chaniel_all.deb
open a command window and change the directory (cd) to where you put the files. Run the following commands:
sudo dpkg -i jedit_4.3~pre18.dfsg-0ubuntu1~blueyedppa1_all.deb lazy8ledger_2.24-0ubuntu1~thomas-chaniel_all.deb
or just skip the sudo and log in first as root (non-ubuntu)
Thats it. Good luck and let us know how it works for you.