I just downloaded the .jar version and did

~# java -jar masterpassword-gui.jar

which opened the GUI.

However, there's no functionality - none of the buttons or fields are clickable - and Terminal is showing the following:

17:30:13,346 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
17:30:13,346 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
17:30:13,346 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [jar:file:/home/j/Desktop/masterpassword-gui.jar!/logback.xml]
17:30:13,356 |-INFO in ch.qos.logback.core.joran.spi.ConfigurationWatchList@340f438e - URL [jar:file:/home/j/Desktop/masterpassword-gui.jar!/logback.xml] is not of type file
17:30:13,421 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
17:30:13,428 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
17:30:13,430 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT]
17:30:13,461 |-WARN in ch.qos.logback.core.ConsoleAppender[STDOUT] - This appender no longer admits a layout as a sub-component, set an encoder instead.
17:30:13,461 |-WARN in ch.qos.logback.core.ConsoleAppender[STDOUT] - To ensure compatibility, wrapping your layout in LayoutWrappingEncoder.
17:30:13,461 |-WARN in ch.qos.logback.core.ConsoleAppender[STDOUT] - See also http://logback.qos.ch/codes.html#layoutInsteadOfEncoder for details
17:30:13,463 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.lyndir] to INFO
17:30:13,463 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to INFO
17:30:13,463 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT]
17:30:13,463 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
17:30:13,464 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@30c7da1e - Registering current configuration as safe fallback point




167                         GUI [INFO ] Local Revision:    <8f1d8976600b0305e8daade529ec8a073a4c7c57>
169                         GUI [INFO ] Upstream Revision: <8f1d8976600b0305e8daade529ec8a073a4c7c57>

Can anyone help?

Happy new year to all.

java -version
openjdk version "1.8.0_151"
OpenJDK Runtime Environment (build 1.8.0_151-8u151-b12-1~deb9u1-b12)
OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)