我在 SSH 登录我的个人服务器时遇到了一个大问题。当我连接时，我在终端中看到以下内容：
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
New release '16.04.3 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
You have new mail.
Connection to fiorenzodeluca.it closed.
其结果ssh -vvv root@fiorenzodeluca是：
Welcome to Ubuntu 15.04 (GNU/Linux 3.18.41-20.el7.x86_64 x86_64)
* Documentation: https://help.ubuntu.com/
System information as of Fri Sep 22 17:39:52 UTC 2017
System load: 0.0 Processes: 101
Usage of /: 12.2% of 23.50GB Users logged in: 0
Memory usage: 6% IP address for eth0: 138.201.105.234
Swap usage: 0%
Graph this data and manage this system at:
https://landscape.canonical.com/
7 packages can be updated.
7 updates are security updates.
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
New release '16.04.3 LTS' available.
debug3: receive packet: type 96
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype [email protected] reply 0
debug2: channel 0: rcvd eow
debug2: channel 0: close_read
debug2: channel 0: input open -> closed
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
Run 'do-release-upgrade' to upgrade to it.
You have new mail.
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i3/0 o3/0 fd -1/-1 cc -1)
debug3: send packet: type 1
Connection to fiorenzodeluca.it closed.
Transferred: sent 2152, received 2928 bytes, in 0.7 seconds
Bytes per second: sent 3258.3, received 4433.3
debug1: Exit status 1
我的 ssh 连接有什么问题？我该如何解决？