Ubuntu 17.10を18.04にアップグレードしてみました。
ネットワーク越しに作業する場合、問題が起きたときのために、予備のsshdを立ち上げてくれます。
試しに1022ポートでアクセスしてみると、アクセスできました。素晴らしい。
New release '18.04 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
$ sudo do-release-upgrade
ネットワーク越しに作業する場合、問題が起きたときのために、予備のsshdを立ち上げてくれます。
Continue running under SSH?
This session appears to be running under ssh. It is not recommended
to perform a upgrade over ssh currently because in case of failure it
is harder to recover.
If you continue, an additional ssh daemon will be started at port
'1022'.
Do you want to continue?
Continue [yN]
Starting additional sshd
To make recovery in case of failure easier, an additional sshd will
be started on port '1022'. If anything goes wrong with the running
ssh you can still connect to the additional one.
If you run a firewall, you may need to temporarily open this port. As
this is potentially dangerous it's not done automatically. You can
open the port with e.g.:
'iptables -I INPUT -p tcp --dport 1022 -j ACCEPT'
To continue please press [ENTER]
試しに1022ポートでアクセスしてみると、アクセスできました。素晴らしい。