1，sudo时出现unable to resolve host 的解决方法

vi /etc/hosts 第一行信息如下：

     127.0.0.1       localhost

     127.0.0.1       hostname  

2,ubuntu apt 更换为国内的源

备份原来的源：

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

更换源:

sudo vim /etc/apt/sources.list

#deb包
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
##测试版源  
deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
# 源码  
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
##测试版源  
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
# Canonical 合作伙伴和附加  
deb http://archive.canonical.com/ubuntu/ xenial partner
deb http://extras.ubuntu.com/ubuntu/ xenial main

执行更新：

sudo apt-get update

复损坏的软件包，尝试卸载出错的包，重新安装正确版本的:

sudo apt-get -f install

更新软件:

sudo apt-get upgrade

3,解决 “git Problem with the SSL CA cert (path? access rights?)” 办法

sudo apt remove ca-certificates

sudo apt install ca-certificates

安装PKS问题
Failed Jobs: pks-nsx-t-prepare-master-vm
参考：https://community.pivotal.io/s/question/0D50e00005880UyCAI/failed-jobs-pksnsxtpreparemastervm-ncp
bosh查看日志，导致问题的原因dns解析不到组件域名
解决：
1，先确认dns的访问是否可达
2，dns中是否配置组件域名，ops-man、bosh、pks-api、registry。