Me, too, on Ubuntu 16.04 prerelease from today.
Running $ bash -x /usr/share/elasticsearch/bin/plugin install elasticsearch/elasticsearch-lang-javascript/2.7.0 I saw that many arguments are double-quoted. I went from + exec /usr/bin/java -Xmx64m -Xms16m -Delasticsearch '-Des.path.home="/usr/share/elasticsearch"' '-Des.default.path.conf="/usr/share/elasticsearch/config"' '-Des.default.config="/usr/share/elasticsearch/config/elasticsearch.yml"' -cp '":/usr/share/java/lucene-join-4.10.4.jar:/usr/share/java/jna.jar:/usr/share/java/lucene-spatial-4.10.4.jar:/usr/share/java/lucene-benchmark-4.10.4.jar:/usr/share/java/lucene-analyzers-smartcn-4.10.4.jar:/usr/share/java/lucene-queries-4.10.4.jar:/usr/share/java/lucene-demo-4.10.4.jar:/usr/share/java/log4j-1.2-1.2.17.jar:/usr/share/java/lucene-replicator-4.10.4.jar:/usr/share/java/lucene-analyzers-morfologik-4.10.4.jar:/usr/share/java/lucene-test-framework-4.10.4.jar:/usr/share/java/lucene-analyzers-common-4.10.4.jar:/usr/share/java/lucene-grouping-4.10.4.jar:/usr/share/java/lucene-analyzers-icu-4.10.4.jar:/usr/share/java/lucene-analyzers-kuromoji-4.10.4.jar:/usr/share/java/lucene-analyzers-phonetic-4.10.4.jar:/usr/share/java/spatial4j-0.4.1.jar:/usr/share/java/lucene-memory-4.10.4.jar:/usr/share/java/jts.jar:/usr/share/java/lucene-facet-4.10.4.jar:/usr/share/java/lucene-suggest-4.10.4.jar:/usr/share/java/lucene-highlighter-4.10.4.jar:/usr/share/java/elasticsearch-1.7.3.jar:/usr/share/ java/lucene-expressions-4.10.4.jar:/usr/share/java/lucene-analyzers-stempel-4.10.4.jar:/usr/share/java/sigar.jar:/usr/share/java/lucene-misc-4.10.4.jar:/usr/share/java/apache-log4j-extras-1.2.17.jar:/usr/share/java/lucene-classification-4.10.4.jar:/usr/share/java/lucene-queryparser-4.10.4.jar:/usr/share/java/lucene-sandbox-4.10.4.jar:/usr/share/java/groovy-all-2.x.jar:/usr/share/java/lucene-core-4.10.4.jar:/usr/share/java/lucene-codecs-4.10.4.jar:/usr/share/java/lucene-analyzers-uima-4.10.4.jar:"' org.elasticsearch.plugins.PluginManager '"install"' '"elasticsearch/elasticsearch-lang-javascript/2.7.0"' Exception in thread "main" org.elasticsearch.env.FailedToResolveConfigException: Failed to resolve config path ["/usr/share/elasticsearch/config/elasticsearch.yml"], tried file path ["/usr/share/elasticsearch/config/elasticsearch.yml"], path file ["/usr/share/elasticsearch/config"/"/usr/share/elasticsearch/config/elasticsearch.yml"], and classpath at org.elasticsearch.env.Environment.resolveConfig(Environment.java:291) at org.elasticsearch.node.internal.InternalSettingsPreparer.prepareSettings(InternalSettingsPreparer.java:95) at org.elasticsearch.plugins.PluginManager.main(PluginManager.java:396) to /usr/bin/java -Xmx64m -Xms16m -Delasticsearch '-Des.path.home="/usr/share/elasticsearch"' '-Des.default.path.conf="/usr/share/elasticsearch/config"' '-Des.default.config=/usr/share/elasticsearch/config/elasticsearch.yml' -cp '":/usr/share/java/lucene-join-4.10.4.jar:/usr/share/java/jna.jar:/usr/share/java/lucene-spatial-4.10.4.jar:/usr/share/java/lucene-benchmark-4.10.4.jar:/usr/share/java/lucene-analyzers-smartcn-4.10.4.jar:/usr/share/java/lucene-queries-4.10.4.jar:/usr/share/java/lucene-demo-4.10.4.jar:/usr/share/java/log4j-1.2-1.2.17.jar:/usr/share/java/lucene-replicator-4.10.4.jar:/usr/share/java/lucene-analyzers-morfologik-4.10.4.jar:/usr/share/java/lucene-test-framework-4.10.4.jar:/usr/share/java/lucene-analyzers-common-4.10.4.jar:/usr/share/java/lucene-grouping-4.10.4.jar:/usr/share/java/lucene-analyzers-icu-4.10.4.jar:/usr/share/java/lucene-analyzers-kuromoji-4.10.4.jar:/usr/share/java/lucene-analyzers-phonetic-4.10.4.jar:/usr/share/java/spatial4j-0.4.1.jar:/usr/share/java/lucene-memory-4.10.4.jar:/usr/share/java/jts.jar:/usr/share/java/lucene-facet-4.10.4.jar:/usr/share/java/lucene-suggest-4.10.4.jar:/usr/share/java/lucene-highlighter-4.10.4.jar:/usr/share/java/elasticsearch-1.7.3.jar:/usr/share/ java/lucene-expressions-4.10.4.jar:/usr/share/java/lucene-analyzers-stempel-4.10.4.jar:/usr/share/java/sigar.jar:/usr/share/java/lucene-misc-4.10.4.jar:/usr/share/java/apache-log4j-extras-1.2.17.jar:/usr/share/java/lucene-classification-4.10.4.jar:/usr/share/java/lucene-queryparser-4.10.4.jar:/usr/share/java/lucene-sandbox-4.10.4.jar:/usr/share/java/groovy-all-2.x.jar:/usr/share/java/lucene-core-4.10.4.jar:/usr/share/java/lucene-codecs-4.10.4.jar:/usr/share/java/lucene-analyzers-uima-4.10.4.jar:"' org.elasticsearch.plugins.PluginManager install 'elasticsearch/elasticsearch-lang-javascript/2.7.0' -> Installing elasticsearch/elasticsearch-lang-javascript/2.7.0... Trying http://download.elasticsearch.org/elasticsearch/elasticsearch-lang-javascript/elasticsearch-lang-javascript-2.7.0.zip... Downloading ...................................................................................................................................DONE Installed elasticsearch/elasticsearch-lang-javascript/2.7.0 into /home/ubuntu/"/usr/share/elasticsearch"/plugins/lang-javascript (i.e. removing some quotes around the action and the config file) and that "fixed" it. Cheers, Axel.