Linux:安装OpenSSH-Server E:Package openssh-server has no installation candidate
$sduo apt-get install openssh-server Reading package lists… Done Building dependency tree Reading state information… Done Package openssh-server is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package openssh-server has no installation candidate
执行:sudo apt-get update 也提示更新失败,或者无内容可更新。
解决方案:sudo vim /etc/network/interfaces修改ip,重启。
执行:sudo apt-get update
问题解决:
http://blog.sina.com.cn/s/blog_3e28c8a50101cax0.html
基础才是编程人员应该深入研究的问题,比如:
1)List/Set/Map内部组成原理|区别
2)mysql索引存储结构&如何调优/b-tree特点、计算复杂度及影响复杂度的因素。。。
3)JVM运行组成与原理及调优
4)Java类加载器运行原理
5)Java中GC过程原理|使用的回收算法原理
6)Redis中hash一致性实现及与hash其他区别
7)Java多线程、线程池开发、管理Lock与Synchroined区别
8)Spring IOC/AOP 原理;加载过程的。。。
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