Q:

Why is SonarQube unable to assign requested address?

I am trying to connect to SonarQube through my browser, however I get the following error message after running sonar start from the terminal:
2016.05.19 19:29:59 ERROR web[o.a.c.h.Http11NioProtocol] Failed to initialize end point associated with ProtocolHandler ["http-nio-192.0.0.1-80"]
java.net.BindException: Cannot assign requested address
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_91]
    at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_91]
    at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_91]
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_91]
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_91]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:340) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:742) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:458) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.coyote.http11.AbstractHttp11JsseProtocol.init(AbstractHttp11JsseProtocol.java:120) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.connector.Connector.initInternal(Connector.java:960) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.core.StandardService.initInternal(StandardService.java:568) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:851) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.apache.catalina.startup.Tomcat.start(Tomcat.java:344) [tomcat-embed-core-8.0.30.jar:8.0.30]
    at org.sonar.server.app.EmbeddedTomcat.start(EmbeddedTomcat.java:62) [sonar-server-5.5.jar:na]
    at org.sonar.server.app.WebServer.start(WebServer.java:43) [sonar-server-5.5.jar:na]
    at org.sonar.process.ProcessEntryPoint.launch(ProcessEntryPoint.java:102) [sonar-process-5.5.jar:na]
    at org.sonar.server.app.WebServer.main(WebServer.java:69) [sonar-server-5.5.jar:na]

It probably has something to do with my configuration, so here's my configuration file:
# Property values can:
# - reference an environment variable, for example sonar.jdbc.url= ${env:SONAR_JDBC_URL}
# - be encrypted. See http://redirect.sonarsource.com/doc/settings-encryption.html

#--------------------------------------------------------------------------------------------------
# DATABASE
#
# IMPORTANT: the embedded H2 database is used by default. It is recommended for tests but not for
# production use. Supported databases are MySQL, Oracle, PostgreSQL and Microsoft SQLServer.

# User credentials.
# Permissions to create tables, indices and triggers must be granted to JDBC user.
# The schema must be created first.
sonar.jdbc.username=sonarqube
sonar.jdbc.password=sonarqube

#----- Embedded Database (default)
# H2 embedded database server listening port, defaults to 9092
# sonar.embeddedDatabase.port=9092

#----- MySQL 5.x
# Only InnoDB storage engine is supported (not myISAM).
# Only the bundled driver is supported. It can not be changed.
sonar.jdbc.url:              jdbc:mysql://localhost:3306/sonarqube?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance
sonar.jdbc.validationQuery:  select 1

#----- Oracle 11g/12c
# - Only thin client is supported
# - Only versions 11.2.x and 12.x of Oracle JDBC driver are supported
# - The JDBC driver must be copied into the directory extensions/jdbc-driver/oracle/
# - If you need to set the schema, please refer to http://jira.sonarsource.com/browse/SONAR-5000
#sonar.jdbc.url=jdbc:oracle:thin:@localhost:1521/XE

#----- PostgreSQL 8.x/9.x
# If you don't use the schema named "public", please refer to http://jira.sonarsource.com/browse/SONAR-5000
#sonar.jdbc.url=jdbc:postgresql://localhost/sonar

#----- Microsoft SQLServer 2008/2012/2014 and SQL Azure
# A database named sonar must exist and its collation must be case-sensitive (CS) and accent-sensitive (AS)
# Use the following connection string if you want to use integrated security with Microsoft Sql Server
# Do not set sonar.jdbc.username or sonar.jdbc.password property if you are using Integrated Security
# For Integrated Security to work, you have to download the Microsoft SQL JDBC driver package from
# http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=11774
# and copy sqljdbc_auth.dll to your path. You have to copy the 32 bit or 64 bit version of the dll
# depending upon the architecture of your server machine.
# This version of SonarQube has been tested with Microsoft SQL JDBC version 4.1
#sonar.jdbc.url=jdbc:sqlserver://localhost;databaseName=sonar;integratedSecurity=true

# Use the following connection string if you want to use SQL Auth while connecting to MS Sql Server.
# Set the sonar.jdbc.username and sonar.jdbc.password appropriately.
#sonar.jdbc.url=jdbc:sqlserver://localhost;databaseName=sonar

#----- Connection pool settings
# The maximum number of active connections that can be allocated
# at the same time, or negative for no limit.
# The recommended value is 1.2 * max sizes of HTTP pools. For example if HTTP ports are
# enabled with default sizes (50, see property sonar.web.http.maxThreads)
# then sonar.jdbc.maxActive should be 1.2 * (50) = 120.
#sonar.jdbc.maxActive=60

# The maximum number of connections that can remain idle in the
# pool, without extra ones being released, or negative for no limit.
#sonar.jdbc.maxIdle=5

# The minimum number of connections that can remain idle in the pool,
# without extra ones being created, or zero to create none.
#sonar.jdbc.minIdle=2

# The maximum number of milliseconds that the pool will wait (when there
# are no available connections) for a connection to be returned before
# throwing an exception, or <= 0 to wait indefinitely.
#sonar.jdbc.maxWait=5000

#sonar.jdbc.minEvictableIdleTimeMillis=600000
#sonar.jdbc.timeBetweenEvictionRunsMillis=30000

#--------------------------------------------------------------------------------------------------
# WEB SERVER

# Web server is executed in a dedicated Java process. By default heap size is 768Mb.
# Use the following property to customize JVM options.
#    Recommendations:
#
#    The HotSpot Server VM is recommended. The property -server should be added if server mode
#    is not enabled by default on your environment: http://docs.oracle.com/javase/7/docs/technotes/guides/vm/server-class.html
#
#sonar.web.javaOpts=-Xmx512m -Xms128m  -XX:MaxPermSize=160m -XX:+HeapDumpOnOutOfMemoryError -Djava.net.preferIPv4Stack=true

# Same as previous property, but allows to not repeat all other settings like -Xmx
#sonar.web.javaAdditionalOpts=

# Binding IP address. For servers with more than one IP address, this property specifies which
# address will be used for listening on the specified ports.
# By default, ports will be used on all IP addresses associated with the server.
sonar.web.host=192.0.0.1

# Web context. When set, it must start with forward slash (for example /sonarqube).
# The default value is root context (empty value).
# sonar.web.context=/sonarqube

# TCP port for incoming HTTP connections. Disabled when value is -1.
sonar.web.port=80

# The maximum number of connections that the server will accept and process at any given time.
# When this number has been reached, the server will not accept any more connections until
# the number of connections falls below this value. The operating system may still accept connections
# based on the sonar.web.connections.acceptCount property. The default value is 50.
#sonar.web.http.maxThreads=50

# The minimum number of threads always kept running. The default value is 5.
#sonar.web.http.minThreads=5

# The maximum queue length for incoming connection requests when all possible request processing
# threads are in use. Any requests received when the queue is full will be refused.
# The default value is 25.
#sonar.web.http.acceptCount=25

# TCP port for incoming AJP connections. Disabled if value is -1. Disabled by default.
#sonar.ajp.port=-1

#--------------------------------------------------------------------------------------------------
# COMPUTE ENGINE
# The Compute Engine is responsible for processing background tasks.
# Compute Engine is executed in a dedicated Java process. By default heap size is 512Mb.
# Use the following property to customize JVM options.
#    Recommendations:
#
#    The HotSpot Server VM is recommended. The property -server should be added if server mode
#    is not enabled by default on your environment: http://docs.oracle.com/javase/7/docs/technotes/guides/vm/server-class.html
#
#sonar.ce.javaOpts=-Xmx512m -Xms128m -XX:MaxPermSize=160m -XX:+HeapDumpOnOutOfMemoryError -Djava.net.preferIPv4Stack=true

# Same as previous property, but allows to not repeat all other settings like -Xmx
#sonar.ce.javaAdditionalOpts=
# The number of workers in the Compute Engine. Value must be greater than zero.
# By default the Compute Engine uses a single worker and therefore processes tasks one at a time.
#    Recommendations:
#
#    Using N workers will require N times as much Heap memory (see property
#    sonar.ce.javaOpts to tune heap) and produce N times as much IOs on disk, database and
#    Elasticsearch. The number of workers must suit your environment.
#sonar.ce.workerCount=1

#--------------------------------------------------------------------------------------------------
# ELASTICSEARCH
# Elasticsearch is used to facilitate fast and accurate information retrieval.
# It is executed in a dedicated Java process.

# JVM options of Elasticsearch process
#    Recommendations:
#
#    Use HotSpot Server VM. The property -server should be added if server mode
#    is not enabled by default on your environment: http://docs.oracle.com/javase/7/docs/technotes/guides/vm/server-class.html
#
#sonar.search.javaOpts=-Xmx1G -Xms256m -Xss256k -Djava.net.preferIPv4Stack=true \
#  -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 \
#  -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError

# Same as previous property, but allows to not repeat all other settings like -Xmx
#sonar.search.javaAdditionalOpts=

# Elasticsearch port. Default is 9001. Use 0 to get a free port.
# As a security precaution, should be blocked by a firewall and not exposed to the Internet.
#sonar.search.port=9001

# Elasticsearch host. The search server will bind this address and the search client will connect to it.
# Default is 127.0.0.1.
# As a security precaution, should NOT be set to a publicly available address.
#sonar.search.host=127.0.0.1

#--------------------------------------------------------------------------------------------------
# UPDATE CENTER

# Update Center requires an internet connection to request http://update.sonarsource.org
# It is enabled by default.
#sonar.updatecenter.activate=true

# HTTP proxy (default none)
#http.proxyHost=
#http.proxyPort=
# HTTPS proxy (defaults are values of http.proxyHost and http.proxyPort)
#https.proxyHost=
#https.proxyPort=

# NT domain name if NTLM proxy is used
#http.auth.ntlm.domain=

# SOCKS proxy (default none)
#socksProxyHost=
#socksProxyPort=

# Proxy authentication (used for HTTP, HTTPS and SOCKS proxies)
#http.proxyUser=
#http.proxyPassword=

#--------------------------------------------------------------------------------------------------
# LOGGING

# Level of logs. Supported values are INFO(default), DEBUG and TRACE (DEBUG + SQL + ES requests)
#sonar.log.level=INFO

# Path to log files. Can be absolute or relative to installation directory.
# Default is <installation home>/logs
#sonar.path.logs=logs

# Rolling policy of log files
#    - based on time if value starts with "time:", for example by day ("time:yyyy-MM-dd")
#      or by month ("time:yyyy-MM")
#    - based on size if value starts with "size:", for example "size:10MB"
#    - disabled if value is "none".  That needs logs to be managed by an external system like logrotate.
#sonar.log.rollingPolicy=time:yyyy-MM-dd

# Maximum number of files to keep if a rolling policy is enabled.
#    - maximum value is 20 on size rolling policy
#    - unlimited on time rolling policy. Set to zero to disable old file purging.
#sonar.log.maxFiles=7

# Access log is the list of all the HTTP requests received by server. If enabled, it is stored
# in the file {sonar.path.logs}/access.log. This file follows the same rolling policy as for
# sonar.log (see sonar.log.rollingPolicy and sonar.log.maxFiles).
#sonar.web.accessLogs.enable=true

# Format of access log. It is ignored if sonar.web.accessLogs.enable=false. Possible values are:
#    - "common" is the Common Log Format, shortcut to: %h %l %u %user %date "%r" %s %b
#    - "combined" is another format widely recognized, shortcut to: %h %l %u [%t] "%r" %s %b "%i{Referer}" "%i{User-Agent}"
#    - else a custom pattern. See http://logback.qos.ch/manual/layouts.html#AccessPatternLayout.
# If SonarQube is behind a reverse proxy, then the following value allows to display the correct remote IP address:
#sonar.web.accessLogs.pattern=%i{X-Forwarded-For} %l %u [%t] "%r" %s %b "%i{Referer}" "%i{User-Agent}"
# Default value is:
#sonar.web.accessLogs.pattern=combined

#--------------------------------------------------------------------------------------------------
# OTHERS

# Delay in seconds between processing of notification queue. Default is 60 seconds.
#sonar.notifications.delay=60

# Paths to persistent data files (embedded database and search index) and temporary files.
# Can be absolute or relative to installation directory.
# Defaults are respectively <installation home>/data and <installation home>/temp
#sonar.path.data=data
#sonar.path.temp=temp

#--------------------------------------------------------------------------------------------------
# DEVELOPMENT - only for developers
# The following properties MUST NOT be used in production environments.

# Dev mode allows to reload web sources on changes and to restart server when new versions
# of plugins are deployed.
#sonar.web.dev=false

# Path to webapp sources for hot-reloading of Ruby on Rails, JS and CSS (only core,
# plugins not supported).
#sonar.web.dev.sources=/path/to/server/sonar-web/src/main/webapp

# Elasticsearch HTTP connector, for example for KOPF:
# http://lmenezes.com/elasticsearch-kopf/?location=http://localhost:9010
#sonar.search.httpPort=-1

How do I solve this problem?
Software used:

Lubuntu
SonarQube 5.5
Firefox

Solutions I've tried:
 - Trying to install sonarqube on linux machine but getting error

A:

The property sonar.web.host is set to 192.0.0.1 in your conf file. localhost can not be resolved to this IP address. You should check /etc/host and fix the mapping.

