The following NEW packages will be installed:
  stopwatch
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/11.2kB of archives.
After unpacking 115kB of additional disk space will be used.
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "en_US.UTF-8",
        LC_ALL = "",",
        LC_CTYPE = "",",
        LANG = "en_US"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
Selecting previously deselected package stopwatch.
(Reading database ... 125563 files and directories currently installed.)
Unpacking stopwatch (from .../stopwatch_3.4-2_all.deb) ...
Setting up stopwatch (3.4-2) ...