Ubuntu 工作站（无显示器）已成功升级至 14.04 并重新启动。
但从那时起我就无法通过 ssh 登录。
有没有什么解决办法？
使用升级
do-release-upgrade
升级成功后会显示重启信息
reboot
ssh -v 的输出
OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g-fips 1 Mar 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to XX.XXX.XXX.XX [XX.XX.XXX.XX] port 22.
debug1: connect to address XX.XXX.XXX.XX port 22: Connection timed out
ssh: connect to host XX.XXX.XXX.XX port 22: Connection timed out