以下是安裝步驟教學。
Step 1
安裝 Tomcat 7：
sudo apt-get install tomcat7 tomcat7-admin tomcat7-docs tomcat7-examples tomcat7-user libservlet3.0-java-doc libservlet3.0-java其實如果沒有特別需求，只要安裝 tomcat7 這個套件就可以了，我個人是喜歡把相關的套件一次全部安裝好，免得以後要用的時候還要再裝一次。
Step 2
從 Guacamole 官方網站下載 Guacamole 安裝檔 guacamole-0.8.1-ubuntu-12.04-amd64.tar.gz：
wget http://downloads.sourceforge.net/project/guacamole/current/binary/ubuntu-12.04-amd64/guacamole-0.8.1-ubuntu-12.04-amd64.tar.gStep 3
解壓縮：
tar zxvf guacamole-0.8.1-ubuntu-12.04-amd64.tar.gz
cd guacamole-0.8.1-ubuntu-12.04-amd64/安裝 Guacamole，根據官方的說明在安裝前先要安裝一些相依性套件：
sudo apt-get install libvncserver0 libfreerdp1 libvorbisenc2 libfreerdp-plugins-standard接著再安裝 Guacamole 的套件：
sudo dpkg -i guacamole_0.8.1-1_all.deb guacd_0.7.0-2_amd64.deb libguac-client-rdp0_0.7.4-1_amd64.deb libguac-client-ssh0_0.8.0-1_amd64.deb libguac-client-vnc0_0.7.2-1_amd64.deb libguac4_0.7.0-1_amd64.deb這裡在安裝時跳過 guacamole-tomcat_0.8.1-1_all.deb 這個檔，因為他預設是使用 Tomcat 6，我們要改用 Tomcat 7，所以這個部分不裝。
如果忘記先安裝相依性套件，就會出現一些相容性問題：
Selecting previously unselected package guacamole.萬一碰到類似的問題時，請注意看每一行訊息，尤其是 error 的部分，找出缺少的套件，自己補裝：
(Reading database ... 347057 files and directories currently installed.)
Unpacking guacamole (from guacamole_0.8.1-1_all.deb) ...
Selecting previously unselected package guacd.
Unpacking guacd (from guacd_0.7.0-2_amd64.deb) ...
Selecting previously unselected package libguac-client-rdp0.
Unpacking libguac-client-rdp0 (from libguac-client-rdp0_0.7.4-1_amd64.deb) ...
Selecting previously unselected package libguac-client-ssh0.
Unpacking libguac-client-ssh0 (from libguac-client-ssh0_0.8.0-1_amd64.deb) ...
Selecting previously unselected package libguac-client-vnc0.
Unpacking libguac-client-vnc0 (from libguac-client-vnc0_0.7.2-1_amd64.deb) ...
Selecting previously unselected package libguac4.
Unpacking libguac4 (from libguac4_0.7.0-1_amd64.deb) ...
dpkg: dependency problems prevent configuration of libguac-client-rdp0:
libguac-client-rdp0 depends on libfreerdp1 (>= 1.0.1); however:
Package libfreerdp1 is not installed.
dpkg: error processing libguac-client-rdp0 (--install):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of libguac-client-ssh0:
libguac-client-ssh0 depends on libssh-4 (>= 0.5.0); however:
Package libssh-4 is not installed.
dpkg: error processing libguac-client-ssh0 (--install):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of libguac-client-vnc0:
libguac-client-vnc0 depends on libvncserver0; however:
Package libvncserver0 is not installed.
dpkg: error processing libguac-client-vnc0 (--install):
dependency problems - leaving unconfigured
Setting up libguac4 (0.7.0-1) ...
Setting up guacd (0.7.0-2) ...
guacd[1401]: INFO: Guacamole proxy daemon (guacd) version 0.7.0
guacd[1401]: INFO: Unable to bind socket to host ::1, port 4822: Address family not supported by protocol
guacd[1401]: INFO: Successfully bound socket to host 127.0.0.1, port 4822
guacd[1401]: INFO: Exiting and passing control to PID 1403
guacd[1403]: INFO: Exiting and passing control to PID 1404
Processing triggers for man-db ...
Processing triggers for ureadahead ...
Setting up guacamole (0.8.1-1) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Errors were encountered while processing:
libguac-client-rdp0
libguac-client-ssh0
libguac-client-vnc0
sudo apt-get install libfreerdp1 libssh-4 libvncserver0補完缺少的套件，然後再裝一次：
sudo dpkg -i guacamole_0.8.1-1_all.deb guacd_0.7.0-2_amd64.deb libguac-client-rdp0_0.7.4-1_amd64.deb libguac-client-ssh0_0.8.0-1_amd64.deb libguac-client-vnc0_0.7.2-1_amd64.deb libguac4_0.7.0-1_amd64.deb像這樣的狀況在安裝一般的軟體時也時常會出現，基本的解決方式就是這樣。
Step 4
設定 /etc/guacamole/user-mapping.xml，加入使用者的設定：
<authorize username="seal" password="seal1234">
<protocol>vnc</protocol>
<param name="hostname">192.168.0.1</param>
<param name="port">5905</param>
<param name="password">VNCPASS</param>
</authorize>第一行的 authorize 標簽中的 username 與 password 是設定網頁登入時的帳號與密碼。第二行的 protocol 標籤是設定傳輸協定，目前可以用的傳輸協定有 vnc、rdp 與 ssh。第三行至第五行就是設定 VNC 伺服器的資訊：伺服器位址（hostname）、連接埠（port）與密碼（password）。
Step 5
將 Guacamole 部署至 Tomcat 7 伺服器中，部署的方式就是建立兩個連結檔：一個是網頁應用程式的 WAR 檔，另外一個則是設定檔：
sudo ln -s /var/lib/guacamole/guacamole.war /var/lib/tomcat7/webapps
sudo ln -s /etc/guacamole/guacamole.properties /var/lib/tomcat7/common/classesStep 6
將 tomcat7 這個 user 加入 guacamole-web 群組，編輯 /etc/group，找到 guacamole-web:x:998: 這一行，在這一行的最後加入 guacamole-web，就像這樣：
guacamole-web:x:998:tomcat7要將 tomcat7 加入 guacamole-web 群組主要是因為 Tomcat 7 在執行時要讀取 /etc/guacamole/user-mapping.xml 這個使用者設定檔，而這個檔案因為安全性的因素，除了 root 之外，就只有 guacamole-web 群組可以讀取，如果忘記做這一步的話，在使用者登入時就會出現無法登入的情況，Tomcat 的記錄檔也會有類似下面這種錯誤訊息：
嚴重的: Error retrieving context for user "seal".
net.sourceforge.guacamole.GuacamoleException: Error reading basic user mapping file.
at net.sourceforge.guacamole.net.basic.BasicFileAuthenticationProvider.getUserMapping(BasicFileAuthenticationProvider.java:129)
at net.sourceforge.guacamole.net.basic.BasicFileAuthenticationProvider.getAuthorizedConfigurations(BasicFileAuthenticationProvider.java:148)
at net.sourceforge.guacamole.net.auth.simple.SimpleAuthenticationProvider.getUserContext(SimpleAuthenticationProvider.java:85)
at net.sourceforge.guacamole.net.basic.AuthenticatingHttpServlet.service(AuthenticatingHttpServlet.java:262)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.io.FileNotFoundException: /etc/guacamole/user-mapping.xml (Permission denied)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.(FileInputStream.java:137)
at net.sourceforge.guacamole.net.basic.BasicFileAuthenticationProvider.getUserMapping(BasicFileAuthenticationProvider.java:119)
... 20 more
Step 7
重新啓動 Tomcat 7：
service tomcat7 restartStep 8
開啟瀏覽器，網址為 http://host:8080/guacamole/，其中 host 就是伺服器的 IP 位址：
登入後，在「All Connections」中可以選擇要開啓的連線。
開啟剛剛設定好的 VNC 連線。
這樣就可以在不安裝任何軟體的狀況下，操控遠端的電腦了。
參考資料：ADMIN、filegott
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