How to 'do-release-upgrade' from 16.04 to 18.04 remotely using PuTTY?

[william drescher]

On 4/6/2019 8:32 AM, Bo Berglund wrote:
> I have an Ubuntu Server 16.04.6 LTS. It is used as a web server,
> OpenVPN server and Subversion backup server.
> It is headless on Intel CPU (64 bit) hardware without both display and
> keyboard. I manage it entirely via PuTTY from my Windows7 PC.
> No graphical interface is installed on this server.
> 
> Now on logon via PuTTY it displays this:
> 
> New release '18.04.2 LTS' available.
> Run 'do-release-upgrade' to upgrade to it.
> 
> When I google this command I get to pages saying it cannot be done
> remotely via SSH, is this true?
> 
> Is there no way to upgrade the system to the next LTS version except
> by hooking up a keyboard and monitor to it (Only VGA video
> available....)???
> 
> 
I am responsible for 3 servers, one of which is located remotely. 
  All my release upgrades from 2000 have been done using PuTTY, 
without a problem.

If you do the release upgrade using PuTTY you will receive a 
warning and then the system will open a 2nd SSH port, just in 
case.  If you lose the PuTTY connection and can't log in again 
you can log in using the 2nd port.

If the connection goes down during the upgrade, the upgrade will 
continue until the upgrading system need information.
-- 
bill