o erro completo:

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_ADDRESS = "pt_PT.UTF-8",
LC_NAME = "pt_PT.UTF-8",
LC_MONETARY = "pt_PT.UTF-8",
LC_PAPER = "pt_PT.UTF-8",
LC_IDENTIFICATION = "pt_PT.UTF-8",
LC_TELEPHONE = "pt_PT.UTF-8",
LC_MEASUREMENT = "pt_PT.UTF-8",
LC_TIME = "pt_PT.UTF-8",
LC_NUMERIC = "pt_PT.UTF-8",
LANG = "C"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

resulta do envio das variáveis de ambiente aquando da ligação ssh.

https://stackoverflow.com/a/2510548

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