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I just upgraded the server from Ubuntu 16.04 to 18.04 and now I am unable to SSH into the server. Any ideas? I'm using Putty on Windows 10.

Edit: Whenever I finish the update and restart the machine. Then Putty prompt ends, saying the connection closed normally. If I try to log on again I get the error message over and over again saying: “Server unexpectedly closed network connection”. I can ping the server. I can reboot the server via my provider but this those not help the problem.

J.Beluche
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    There is any error message ? You just can't reach your server ? Can you ping it ? We cannot help you without additionnal informations. Please update your question. – Eraseth Jul 11 '18 at 14:07
  • Check your syslog (/var/log/syslog on your ubuntu server) for error messages. – John Anderson Jul 11 '18 at 14:22
  • I updated the question, sorry for the lack of information. – J.Beluche Jul 12 '18 at 14:30
  • I cannot access Ubuntu at all. – J.Beluche Jul 12 '18 at 14:30
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    Welcome to Ask Ubuntu! Does the (virtual) machine boot at all? If so, what's the output of sudo systemctl start ssh.service; sudo systemctl status ssh.service? – David Foerster Jul 22 '18 at 16:28
  • I think this was a great question, and should be reopened. When you upgrade a VPS to 18.04 and after a reboot you cannot SSH in, you don't have a lot of clues to go on. I am going to post my experience here for the next poor unfortunate soul. – wruckie Aug 14 '18 at 14:34
  • posted my fix here https://askubuntu.com/questions/1037131/lost-ssh-access-after-upgrade-to-18-04/1065319#1065319 – wruckie Aug 14 '18 at 14:48

1 Answers1

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Check your ssh settings on server, usually what happens in that after upgrade ssh service stops running so you have to re-enable it manually.

sudo service ssh start
sleepyhead
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  • And how are you supposed to do that if you can't ssh into the server? – DevOpsSauce Jun 21 '23 at 14:48
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    @DevOpsSauce that is a very good question, I was in luck and had physical access, so logged in and restored the service. Not sure why do I get so many dislikes, it did solve the issue for me. – sleepyhead Jun 21 '23 at 16:29