ubuntu14.04 Cannot add PPA: 'ppa:openjdk-r/ppa'.

tangh

Q:
xxx@xxx-virtual-machine:~$ sudo add-apt-repository ppapenjdk-r/ppa
Cannot add PPA: 'ppapenjdk-r/ppa'.
Please check that the PPA name or format is correct.
xxx@xxx-virtual-machine:~$ sudo apt-get install openjdk-8-jdk
Reading package lists... Done
Building dependency tree      
Reading state information... Done
E: Unable to locate package openjdk-8-jdk

s:
1是CA证书损坏，可以通过命令 sudo apt-get install --reinstall ca-certificates来修复；
2是网络代理问题，可以通过sudo -E add-apt-repository ppa:webupd8team/java把上面第一条命令换掉来解决问题

1. sudo apt-get install --reinstall ca-certificates
   
2. sudo add-apt-repository ppa:openjdk-r/ppa
   
3. sudo apt-get update
   
4. sudo apt-get install openjdk-8-jdk

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