我正在安装 Ubuntu Server，我想知道它们之间有什么区别：
[ ] OpenSSH server
[ ] DNS server
[ ] LAMP server
[ ] Mail server
[ ] PostgreSQL server
[ ] Print server
[ ] Samba file server
[ ] Tomcat Java server
[ ] Virtual Machine host
[ ] Manual package selection
谁能解释一下？
我应该如何在终端会话中在 Ubuntu 14.04 上安装Remarkable 编辑器？
# sudo mkdir /hadoop-data/hadoopmaster/hdfs/namenode
mkdir: cannot create directory ‘/hadoop-data/hadoopmaster/hdfs/namenode’: No such file or directory