I try to set up GenyMotion for Jenkins and installed libgl1-mesa-dev package for GenyMotion. During installation this package I noticed that some packages were removed, for example, skype, teamviewer (it's very strange!) and maybe some jenkins files (it is my suggestion).After I installed this package and rebooted machine, I can not start Jenkins.

Error log contains following messages:

SEVERE: Failed Loading plugin gitlab-hook
java.io.IOException: Unable to load ruby.RubyPlugin from gitlab-hook
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:355)
at hudson.PluginManager$2$1$1.run(PluginManager.java:357)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:905)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassNotFoundException: ruby.RubyPlugin
at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1375)
at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1078)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:346)
... 9 more

Please help.