From Ubuntu 20.10 Groovy Gorilla to Ubuntu 21.04 Hirsute Hippo
$ sudo apt update
$ sudo apt upgrade
$ sudo apt dist-upgrade
$ sudo apt autoremove
$ sudo iptables -I INPUT -p tcp --dport 1022 -j ACCEPT
$ sudo do-release-upgrade -c
$ sudo do-release-upgrade
[t] 2021-07-21 22:17:51
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