我已经正确安装了java。
aaa@ubuntu:~$ whereis java
java: /usr/bin/java /usr/bin/X11/java /usr/local/java /usr/share/java
aaa@ubuntu:~$ whereis javac
javac: /usr/bin/javac /usr/bin/X11/javac
但是当我尝试将/usr/bin/javaIntellyJ Idea12 中的位置添加为 Java 项目 sdk 时，我无法这样做，因为它需要文件夹并且/usr/bin/java是一个文件。即使我指定了/usr/bin，它也会说它不是一个有效的位置。
那么它位于何处以及如何将位置设置为 IntellyJ Idea12 或 Eclipse 的 java sdk？
更新：路径“/usr/lib/jvm/”不存在
更新2：
我使用了本教程http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux
我尝试在 Ubuntu 12 上安装 Ruby。有一个命令给我一个错误
E: 无法定位包 pkgconfig
sudo apt-get install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion pkgconfig
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'libxslt1-dev' instead of 'libxslt-dev'
Note, selecting 'libncurses5-dev' instead of 'ncurses-dev'
E: Unable to locate package pkgconfig
我什至做了
sudo apt-get update && sudo apt-get install pkgconfig
但它没有帮助。
如何安装 pkgconfig？
如果它以某种方式帮助你
alex@ubuntu:~$ cat /etc/apt/sources.list
# deb …我浏览了一个教程http://craiccomputing.blogspot.com/2010/10/passenger-3-nginx-and-rvm-on-mac-os-x.html，一切正常。没有错误。
Nginx with Passenger support was successfully installed.
The Nginx configuration file (/opt/nginx/conf/nginx.conf)
must contain the correct configuration options in order for Phusion Passenger
to function correctly.
This installer has already modified the configuration file for you! The
following configuration snippet was inserted:
http {
...
passenger_root /home/alex/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.14;
passenger_ruby /home/alex/.rvm/wrappers/ruby-1.9.3-p194/ruby;
...
}
After you start Nginx, you are ready to deploy any number of Ruby on Rails
applications on Nginx.
但是我无法启动它。
alex@ubuntu:~$ sh -x /etc/init.d/nginx start
sh: 0: …我已经安装了java
aaa@ubuntu:~$ whereis java
java: /usr/bin/java /usr/bin/X11/java /usr/local/java /usr/share/java
aaa@ubuntu:~$ whereis javac
javac: /usr/bin/javac /usr/bin/X11/javac
和等/配置文件
JAVA_HOME=/usr/local/java/jdk1.7.0_17
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JRE_HOME=/usr/local/java/jre1.7.0_17
PATH=$PATH:$HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
但是，当我运行 Android Studio 时，它说：
tools.jar in not in Android Studio classpath. Please ensure you have JAVA_HOME points
to JDK rather than JRE.
我如何解决它？
更新
sudo update-alternatives --get-selections | grep ^java
java manual /usr/local/java/jre1.7.0_17/bin/java
javac manual /usr/local/java/jdk1.7.0_17/bin/javac
javaws manual /usr/local/java/jre1.7.0_17/bin/javaws
java -version
java version "1.7.0_17"
我已经正确安装了 Java，我按照手册http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux做到了
我还安装了 Android SDK。但是，当我尝试创建一个新的 Project IntelliJ Idea 12 并指定 Project SDk 选择 New -> 时/home/alex/android-sdk-linux，它说我
No Java SDK of appropriate version found. In addition to the Android SDK, you need to define a JSDK 1.5, 1.6 or 1.7
我错过了什么？
尝试在 Ubuntu 12 上安装 Skype，我遇到了问题。当我输入：
sudo apt-get update
sudo apt-get install skype
我收到一个错误
Reading package lists... Done
Building dependency tree
Reading state information... Done
skype is already the newest version.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
skype : Depends: lib32stdc++6 (>= 4.1.1-21) but it is not going to be installed
Depends: lib32asound2 (> 1.0.14) but it is not going to be installed
Depends: ia32-libs but it is not going …有谁知道在 Ubuntu 12.10 中最小化所有窗口的好方法吗？我看了几篇文章，没有发现任何有价值的。例如，
CompizConfig Manager无法正常工作，有时出于某种原因不会最小化所有窗口。此外，不建议使用它（AskUbuntu上有说）我正在尝试安装 phusion 乘客。
passenger-install-nginx-module
最终我得到了一个错误
Permission problems
This installer must be able to write to the following directory:
/opt/nginx
But it can't do that, because you're running the installer as alex.
Please re-run this installer as root.
我试着做
sudo passenger-install-nginx-module
但它说
sudo: passenger-install-nginx-module: command not found
我该如何解决？