Cryptomator fails to start on Ubuntu MATE 16.04

Basic Info

Package ‘cryptomator-1.3.2-i386.deb’ was installed on a 32-bit Ubuntu MATE 16.04 with OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-1ubuntu0.16.04.1-b13) as the only one alternative in link group java.


Lintian finishes with exit status 1, see Lintian output and other error logfiles.

There is no /usr/bin/ to run.

Executing /opt/Cryptomator/Cryptomator fails with Segmentation fault (core dumped) (see error log files referenced above). From what I have researched this is probably a Java related problem.

Executing java -jar /opt/Cryptomator/app/Cryptomator-1.3.2.jar fails with Exception in thread "main" java.lang.NoClassDefFoundError.

There are similarities to:

  • Starting Cryptomator 1.2.0 on Linux with OpenJDK 9 fails #390 (but I am already using OpenJDK 8)
  • Cryptomator is totally broken on Linux Mint 18 and java JRE 1.8.0 #432 (but I am not using Oracle JRE)
  • Cryptomator doesn’t start: access violation #523 (but workaround has no effect for me)
  • ubuntu - app fails to start #559 (but I am using java-8-openjdk-i386)
  • Cryptomator 1.4.0 refused to start on ArchLinux #763 (but I am using java-8-openjdk-i386)
  • Cryptomator fails to start on Ubuntu 18.04 LTS (but I am using java-8-openjdk-i386)

Better late than never: Cryptomator 1.3.x still required JavaFX, which was not part of OpenJDK. That is why running it via java -jar with OpenJDK failed.

In the meantime this has changed. Cryptomator 1.4.x is based on OpenJDK 11 and can run on basically any 64 bit Java 11 JRE.