software installation - How do I install Lazarus in Ubuntu 17.04?

How do I install lazarus-1.6.4-fpc-3.0.2 34/64 bit on Ubuntu 17.04? I have previously installed Lazarus without problems on Ubuntu 16.04 and earlier versions; but, installation fails with Ubuntu 17.04. Something changed.
Help greatly appreciated.

More Details:

1. Downloaded the three DEB Lazarus from https://sourceforge.net/projects/lazarus/files/Lazarus%20Linux%20amd64%20DEB/Lazarus%201.6.4/


2. Saved to Downloads directory.


3. Double clicked on first file. The file was set to open with "Ubuntu Software".


4. A window opens with an "install" button.



5. Clicked on the "install" button.


6. Nothing happens, no errors shown, no authorization dialog box.


7. Tried the other two files, same result; nothing!!

With earlier versions of Ubuntu, Lazarus was successfully installed using the "Ubuntu Software" application. However; with Ubuntu 17.04, the same "Ubuntu Software" install application does not work.