[Bug 1023421] Re: Update Manager can't set LC_MESSAGES to default locale

[dg1727]

I'm having the problem, or a similar one, on Linux Mint 18.1 Serena
XFCE, which is based on Xenial.

My version of this problem affects many programs, not just update-
manager:

man: can't set the locale; make sure $LC_* and $LANG are correct

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = (unset),
	LC_ALL = (unset),
	LANG = "en_US"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

"pip" doesn't run at all.  locale.Error: unsupported locale setting

So I did:  (% is the shell prompt)

% locale
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
LANG=en_US
LANGUAGE=
LC_CTYPE="en_US"
LC_NUMERIC="en_US"
LC_TIME="en_US"
LC_COLLATE="en_US"
LC_MONETARY="en_US"
LC_MESSAGES="en_US"
LC_PAPER="en_US"
LC_NAME="en_US"
LC_ADDRESS="en_US"
LC_TELEPHONE="en_US"
LC_MEASUREMENT="en_US"
LC_IDENTIFICATION="en_US"
LC_ALL=
% grep en_US /usr/share/i18n/SUPPORTED
en_US.UTF-8 UTF-8
en_US ISO-8859-1
en_US.ISO-8859-15 ISO-8859-15
% LANG=en_US.UTF-8
% man {some program}
# Now the error message isn't displayed!  -- and likewise in programs that use Perl. 

I'm having the issue with en_US (no other locale has ever been selected
in this OS install), *not* one of the locales mentioned in the linked
bug-report https://bugs.python.org/issue20087

I was getting the same error messages in Linux Mint Debian Edition 2
"Betsy", which is based on Debian stable/jessie.  I can do a little more
testing on that OS install if it's relevant to this bug report.

I searched on Launchpad for similar issues, but this one I'm commenting
in is the closest one I've found.

Of course, I can put a file in /etc/profile.d/ to set LANG=en_US.UTF-8
when anyone logs in, but I hope a bug report has been, or will be, filed
against the relevant package.

Please let me know if there is a more appropriate bug report I should
monitor and/or comment in.

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https://bugs.launchpad.net/bugs/1023421

Title:
  Update Manager can't set  LC_MESSAGES to default locale

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  When I try to Update Ubuntu I always see the following lines moving
  up.  These lines appear (when I click on 'Details') frequently while
  updating.  I wish to know whether it is an internal error.  Need I do
  anything?   I doubt my question about sending Emails by Thunderbird
  (Not solved yet; but now removed from my launchpad 'answers') is a
  side effect of this.

  The repeating lines are these:
  ---------------------------------------------------
  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
  --------------------------------------------------
  Should I ignore all these?

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