Shell

nano --linenumbers [filename]

       -l, --linenumbers
              Display line numbers to the left of the text area.

ALT + SHIFT + #   for ubuntu

Accidentally found nice shortcut: Alt+#, which in some keyboard layouts can be done with Alt+Shift+3.

according to the man page for nanorc, you can add set linenumbers in ~/.nanorc, /etc/nanorc, $XDG_CONFIG_HOME/nano/nanorc or ~/.config/nano/nanorc.

To show line numbers along the side: ALT + SHIFT + 3
To show cursor position at the bottom: ALT + C (or CTRL + C for temporary)

nano -l foo.txt
nano --linenumbers foo.txt

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