I uploaded rxtx_2.2pre2+dfsg1-1ubuntu1_source.changes as an SRU now.
Hopefully this hits the archive soon.

** Changed in: rxtx (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: rxtx (Ubuntu Bionic)
       Status: Confirmed => In Progress

** Description changed:

+ [TEST CASE]
  Steps to reproduce:
  1. Install Ubuntu 18.04 LTS
  2. Install Arduino IDE with `sudo apt-get install arduino`
  3. Add your user to dialout group with `sudo usermod -a -G dialout $USER`
  4. Connect Arduino board to the computer
  5. Launch Arduino IDE
  
  Expected results:
  Arduino IDE works normally, user can upload program to board and use Serial 
Monitor and Serial Plotter.
  
  Actual results:
- The serial-port functionality of Arduino IDE is broken, it shows the 
following messages in termina - 
+ The serial-port functionality of Arduino IDE is broken, it shows the 
following messages in termina -
  
  $ arduino
  java.lang.NullPointerException thrown while loading gnu.io.RXTXCommDriver
  java.lang.NullPointerException thrown while loading gnu.io.RXTXCommDriver
  
- 
  Notes:
  1. steps 3-4 are not really necessary.
  2. first seen on AskUbuntu ( https://askubuntu.com/q/1034173/66509 ).
+ 
+ [ REGRESSION POTENTIAL ]
+ * low: using this driver is already broken so its hard to make the situation 
worse
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: librxtx-java 2.2pre2+dfsg1-1
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May 11 12:40:54 2018
  Dependencies:
-  gcc-8-base 8-20180414-1ubuntu2
-  libc6 2.27-3ubuntu1
-  libgcc1 1:8-20180414-1ubuntu2
+  gcc-8-base 8-20180414-1ubuntu2
+  libc6 2.27-3ubuntu1
+  libgcc1 1:8-20180414-1ubuntu2
  InstallationDate: Installed on 2018-04-28 (12 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: rxtx
  UpgradeStatus: No upgrade log present (probably fresh install)

** Changed in: arduino (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: arduino (Ubuntu Bionic)
       Status: Confirmed => In Progress

** Changed in: arduino (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1770604

Title:
  Arduino IDE from repository does not work because of
  "java.lang.NullPointerException thrown while loading
  gnu.io.RXTXCommDriver"

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