我是 Ubuntu 新手
我尝试过这个：
sudo add-apt-repository -y ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java9-installer
但失败了：
download failed
Oracle JDK 9 is NOT installed.
dpkg: error processing package oracle-java9-installer (--configure):
subprocess installed post-installation script returned error exit status >1
Errors were encountered while processing:
oracle-java9-installer
E: Sub-process /usr/bin/dpkg returned an error code (1)
谁能帮我？