解决：no matching key exchange method found. Their offer: diffie-hellman-group1-sha1

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