title: Exception on download: sun.security.validator.ValidatorException: No trusted certificate found
body: <p>I'm trying to use sbt on Ubuntu 16.04, but am getting errors when trying to run it. I did a fresh install, then followed the directions exactly from <a href="http://www.scala-sbt.org/0.13/docs/Hello.html" rel="noreferrer">the sbt site</a>, but get the following when I do <code>sbt</code>:</p>
  
  <pre><code>Getting org.scala-sbt sbt 0.13.12 ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/main/0.13.12/jars/main.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/compiler-interface/0.13.12/jars/compiler-interface.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/actions/0.13.12/jars/actions.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/main-settings/0.13.12/jars/main-settings.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/io/0.13.12/jars/io.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/ivy/0.13.12/jars/ivy.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/command/0.13.12/jars/command.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/completion/0.13.12/jars/completion.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/api/0.13.12/jars/api.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/collections/0.13.12/jars/collections.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/incremental-compiler/0.13.12/jars/incremental-compiler.jar ...
  downloading https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/compile/0.13.12/jars/compile.jar ...
  
  :: problems summary ::
  :::: WARNINGS
          [FAILED     ] org.scala-sbt#main;0.13.12!main.jar: sun.security.validator.ValidatorException: No trusted certificate found (1180ms)
  
          [FAILED     ] org.scala-sbt#main;0.13.12!main.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/main/0.13.12/jars/main.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/main/0.13.12/main-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/main/0.13.12/jars/main.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/main/0.13.12/jars/main.jar
  
          [FAILED     ] org.scala-sbt#compiler-interface;0.13.12!compiler-interface.jar: sun.security.validator.ValidatorException: No trusted certificate found (577ms)
  
          [FAILED     ] org.scala-sbt#compiler-interface;0.13.12!compiler-interface.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/compiler-interface/0.13.12/jars/compiler-interface.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/compiler-interface/0.13.12/compiler-interface-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/compiler-interface/0.13.12/jars/compiler-interface.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/compiler-interface/0.13.12/jars/compiler-interface.jar
  
          [FAILED     ] org.scala-sbt#actions;0.13.12!actions.jar: sun.security.validator.ValidatorException: No trusted certificate found (569ms)
  
          [FAILED     ] org.scala-sbt#actions;0.13.12!actions.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/actions/0.13.12/jars/actions.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/actions/0.13.12/actions-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/actions/0.13.12/jars/actions.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/actions/0.13.12/jars/actions.jar
  
          [FAILED     ] org.scala-sbt#main-settings;0.13.12!main-settings.jar: sun.security.validator.ValidatorException: No trusted certificate found (666ms)
  
          [FAILED     ] org.scala-sbt#main-settings;0.13.12!main-settings.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/main-settings/0.13.12/jars/main-settings.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/main-settings/0.13.12/main-settings-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/main-settings/0.13.12/jars/main-settings.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/main-settings/0.13.12/jars/main-settings.jar
  
          [FAILED     ] org.scala-sbt#io;0.13.12!io.jar: sun.security.validator.ValidatorException: No trusted certificate found (597ms)
  
          [FAILED     ] org.scala-sbt#io;0.13.12!io.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/io/0.13.12/jars/io.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/io/0.13.12/io-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/io/0.13.12/jars/io.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/io/0.13.12/jars/io.jar
  
          [FAILED     ] org.scala-sbt#ivy;0.13.12!ivy.jar: sun.security.validator.ValidatorException: No trusted certificate found (644ms)
  
          [FAILED     ] org.scala-sbt#ivy;0.13.12!ivy.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/ivy/0.13.12/jars/ivy.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/ivy/0.13.12/ivy-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/ivy/0.13.12/jars/ivy.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/ivy/0.13.12/jars/ivy.jar
  
          [FAILED     ] org.scala-sbt#command;0.13.12!command.jar: sun.security.validator.ValidatorException: No trusted certificate found (762ms)
  
          [FAILED     ] org.scala-sbt#command;0.13.12!command.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/command/0.13.12/jars/command.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/command/0.13.12/command-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/command/0.13.12/jars/command.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/command/0.13.12/jars/command.jar
  
          [FAILED     ] org.scala-sbt#completion;0.13.12!completion.jar: sun.security.validator.ValidatorException: No trusted certificate found (594ms)
  
          [FAILED     ] org.scala-sbt#completion;0.13.12!completion.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/completion/0.13.12/jars/completion.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/completion/0.13.12/completion-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/completion/0.13.12/jars/completion.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/completion/0.13.12/jars/completion.jar
  
          [FAILED     ] org.scala-sbt#api;0.13.12!api.jar: sun.security.validator.ValidatorException: No trusted certificate found (585ms)
  
          [FAILED     ] org.scala-sbt#api;0.13.12!api.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/api/0.13.12/jars/api.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/api/0.13.12/api-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/api/0.13.12/jars/api.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/api/0.13.12/jars/api.jar
  
          [FAILED     ] org.scala-sbt#collections;0.13.12!collections.jar: sun.security.validator.ValidatorException: No trusted certificate found (568ms)
  
          [FAILED     ] org.scala-sbt#collections;0.13.12!collections.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/collections/0.13.12/jars/collections.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/collections/0.13.12/collections-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/collections/0.13.12/jars/collections.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/collections/0.13.12/jars/collections.jar
  
          [FAILED     ] org.scala-sbt#incremental-compiler;0.13.12!incremental-compiler.jar: sun.security.validator.ValidatorException: No trusted certificate found (672ms)
  
          [FAILED     ] org.scala-sbt#incremental-compiler;0.13.12!incremental-compiler.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/incremental-compiler/0.13.12/jars/incremental-compiler.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/incremental-compiler/0.13.12/incremental-compiler-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/incremental-compiler/0.13.12/jars/incremental-compiler.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/incremental-compiler/0.13.12/jars/incremental-compiler.jar
  
          [FAILED     ] org.scala-sbt#compile;0.13.12!compile.jar: sun.security.validator.ValidatorException: No trusted certificate found (587ms)
  
          [FAILED     ] org.scala-sbt#compile;0.13.12!compile.jar:  (0ms)
  
      ==== local: tried
  
        /home/james/.ivy2/local/org.scala-sbt/compile/0.13.12/jars/compile.jar
  
      ==== Maven Central: tried
  
        https://repo1.maven.org/maven2/org/scala-sbt/compile/0.13.12/compile-0.13.12.jar
  
      ==== typesafe-ivy-releases: tried
  
        https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/compile/0.13.12/jars/compile.jar
  
      ==== sbt-ivy-snapshots: tried
  
        https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/compile/0.13.12/jars/compile.jar
  
          ::::::::::::::::::::::::::::::::::::::::::::::
  
          ::              FAILED DOWNLOADS            ::
  
          :: ^ see resolution messages for details  ^ ::
  
          ::::::::::::::::::::::::::::::::::::::::::::::
  
          :: org.scala-sbt#main;0.13.12!main.jar
  
          :: org.scala-sbt#actions;0.13.12!actions.jar
  
          :: org.scala-sbt#io;0.13.12!io.jar
  
          :: org.scala-sbt#completion;0.13.12!completion.jar
  
          :: org.scala-sbt#collections;0.13.12!collections.jar
  
          :: org.scala-sbt#api;0.13.12!api.jar
  
          :: org.scala-sbt#incremental-compiler;0.13.12!incremental-compiler.jar
  
          :: org.scala-sbt#compile;0.13.12!compile.jar
  
          :: org.scala-sbt#ivy;0.13.12!ivy.jar
  
          :: org.scala-sbt#main-settings;0.13.12!main-settings.jar
  
          :: org.scala-sbt#command;0.13.12!command.jar
  
          :: org.scala-sbt#compiler-interface;0.13.12!compiler-interface.jar
  
          ::::::::::::::::::::::::::::::::::::::::::::::
  
  
  
  :: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS
  download failed: org.scala-sbt#main;0.13.12!main.jar
  download failed: org.scala-sbt#actions;0.13.12!actions.jar
  download failed: org.scala-sbt#io;0.13.12!io.jar
  download failed: org.scala-sbt#completion;0.13.12!completion.jar
  download failed: org.scala-sbt#collections;0.13.12!collections.jar
  download failed: org.scala-sbt#api;0.13.12!api.jar
  download failed: org.scala-sbt#incremental-compiler;0.13.12!incremental-compiler.jar
  download failed: org.scala-sbt#compile;0.13.12!compile.jar
  download failed: org.scala-sbt#ivy;0.13.12!ivy.jar
  download failed: org.scala-sbt#main-settings;0.13.12!main-settings.jar
  download failed: org.scala-sbt#command;0.13.12!command.jar
  download failed: org.scala-sbt#compiler-interface;0.13.12!compiler-interface.jar
  Error during sbt execution: Error retrieving required libraries
    (see /home/james/.sbt/boot/update.log for complete log)
  Error: Could not retrieve sbt 0.13.12
  </code></pre>
  
  <p>I'm not sure what would be causing this. I also tried <code>sudo sbt</code>, which made no difference (in case it was a permissions error). I should note that some downloads succeed.</p>
  
  <p>Edit:</p>
  
  <p>Here's some proof I'm doing it right:</p>
  
  <p><a href="https://i.stack.imgur.com/7dq2k.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7dq2k.png" alt="I&#39;m not dumb"></a></p>