Install nano 9.3 on Ubuntu 22.04

Ubuntu 22.04 ships nano 6.2. The current release is 9.3. freshdeb builds it for jammy from upstream's release with Debian's packaging, so it replaces the distribution's package in place and updates with apt upgrade like the rest of the system.

Ubuntu 22.04 ships: 6.26.2-1ubuntu0.3
main: 9.3follows every upstream release, minors and majors included. Currently 9.3.
Built for: amd64 and arm64, natively

1Trust the signing key (once per machine)

sudo install -d -m 0755 /etc/apt/keyrings
curl -fsSL https://deb.freshdeb.com/freshdeb-archive-keyring.gpg \
  | sudo tee /etc/apt/keyrings/freshdeb-archive-keyring.gpg >/dev/null

Fingerprint 3BBD F03A 9C0B F890 F8CA 9510 7595 CC55 468F 3161. How to verify.

2Add the source for jammy

sudo tee /etc/apt/sources.list.d/freshdeb-nano.sources >/dev/null <<EOF
Types: deb
URIs: https://deb.freshdeb.com/nano
Suites: jammy
Components: main
Signed-By: /etc/apt/keyrings/freshdeb-archive-keyring.gpg
EOF

3Install

sudo apt update && sudo apt install nano
apt policy nano   # expect 9.3-1+freshdeb~ubuntu22.04

Already on Ubuntu 22.04's nano? The same command upgrades it: the freshdeb version sorts higher. What's different from Debian's package.

Upgrading from nano 6.2

What changed between Ubuntu 22.04's 6.2 and 9.3 that you may notice. Configuration and data stay where Debian put them.

Since 8.0: ^F and ^B search forward and backward instead of moving the cursor, and M-F and M-B repeat the search. To get the old keys back, put bind ^F forward main, bind ^B back main, bind M-F formatter main and bind M-B linter main in ~/.nanorc or /etc/nanorc.
Since 8.1: ^L cycles the current line to the center, the top and the bottom of the screen.
Since 9.0: M-< and M-> no longer switch between open files (bind M-< prevbuf main and bind M-> nextbuf main bring that back), the ^T toggle between WhereIs and GotoLine is gone, and files in old Mac format, with a lone carriage return per line, are no longer read or written as such.
Also: The package's NEWS entry lists the same, and apt-listchanges shows it during the upgrade.

Going back to 6.2

Delete /etc/apt/sources.list.d/freshdeb-nano.sources, run sudo apt update, then sudo apt install nano=6.2-1ubuntu0.3: apt asks before it downgrades. Name the other nano packages you installed with their Ubuntu 22.04 version too.

nano elsewhere

nano: every release line, its contents and origin