升级到ubuntu-16.04后，发现git-review代码报错：
Could not connect to gerrit at ...
执行：
$ ssh -i ~/.ssh/id_rsa.pub -p 29418 192.168.1.101
报错：
Unable to negotiate with 192.168.1.101 port 29418: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1
解决：修改~/.ssh/config，加入：
Host *
KexAlgorithms +diffie-hellman-group1-sha1