How To Upgrade Ubuntu to Latest version
Run Commands
EasiestSoft@Ubnutu:~ $ sudo apt update
$ sudo apt upgrade
$ sudo apt dist-upgrade
$ sudo apt install update-manager-core
$ sudo do-release-upgrade
Allow additional ssh port
Continue running under SSH?
...
If you continue, an additional ssh daemon will be started at port '1022'.
Do you want to continue?
Continue [yN] y
Then at the prompt, type y and press Enter to continue
Starting additional sshd
To make recovery in case of failure easier, an additional sshd will
...
'iptables -I INPUT -p tcp --dport 1022 -j ACCEPT'
To continue please press [ENTER]
Run commands to allow 1022/tcp:
EasiestSoft@Ubuntu:~ $ sudo ufw allow 1022/tcp
Press Enter
Rewrite sources.list
Updating repository information
No valid mirror found
...
If you select 'No' the upgrade will cancel
Continue [yN] y
Nginx configurations, Keep currently
/etc/ssh/sshd_config
Keep the local version currently current installed
Restart system
Finally, remove rule allow 1022/tcp from ufw
EasiestSoft@Ubuntu:~ $ sudo ufw delete allow 1022/tcp
$ reboot
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