Hello:
I am running into this error when trying to start a nerves.system.shell to customize buildroot. But to keep the debug and this discussion simpler I am using the workspace from nerves_examples/blinky and see the same error.

venkat@XPS-8930:~/work/pp/nerves/nerves_examples/blinky$ mix nerves.system.shell
==> nerves
sh: 1: exec: tty_sl: not found
** (ArgumentError) argument error
    :erlang.port_control(#Port<0.6>, 25889124, [])
    (nerves 1.10.3) lib/mix/nerves/shell.ex:106: Mix.Nerves.Shell.get_tty_geometry/1
    (nerves 1.10.3) lib/mix/nerves/shell.ex:49: Mix.Nerves.Shell.open/2
    (nerves_bootstrap 1.11.5) lib/attic/system.shell.ex:74: Mix.Tasks.Nerves.System.Shell.run/1
    (mix 1.15.4) lib/mix/task.ex:447: anonymous fn/3 in Mix.Task.run_task/5
    (mix 1.15.4) lib/mix/cli.ex:92: Mix.CLI.run_task/2
    /home/venkat/.asdf/installs/elixir/1.15.4-otp-26/bin/mix:2: (file)

I did run into this sh: 1: exec: tty_sl: not found - Questions / Help - Erlang Programming Language Forum - Erlang Forums which says I may have old version of rebar.

Could this be related to rebar?

Thanks,
Venkat