I havent tried Notes 9 on the 32 bit Ubuntu in detail only to compare installations, when I did my how to for 64 bit.
I think you should try to install on 32 bit to see if it is the same as in 64 bit as 32 bit is supported.
I did not look for bugs in Java applet, but the bugs I saw was the same in 32 bit as they where in 64 bit, which was frustrating as I found the bug first in 64 and thought it was because it was 64 bit and tried to solve it because of that.
After that I decided to run both installations in paralell as I already had vmware workstation running.
regards
Mats