Locale Problem?

[EndianX]

When I use apt to install anything, I get errors such as this:

sumo:/etc/init.d# apt-get install most
Reading Package Lists... Done
Building Dependency Tree... Done
The following NEW packages will be installed:
  most
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 42.2kB of archives.
After unpacking 147kB of additional disk space will be used.
Get:1 http://mirrors.kernel.org stable/main most 4.9.5-1 [42.2kB]
Fetched 42.2kB in 1s (36.7kB/s)
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "en_US:en_GB:en",
        LC_ALL = (unset),
        LANG = "en"
    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 most.
(Reading database ... 21108 files and directories currently installed.)
Unpacking most (from .../archives/most_4.9.5-1_i386.deb) ...
Setting up most (4.9.5-1) ...
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "en_US:en_GB:en",
        LC_ALL = (unset),
        LANG = "en"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

Anybody know what might be wrong here? Looks like there is some setting somewhere I need to set.

[EndianX]

Just got this when running man.

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

Something is definitly very wrong and it seems to be important.

[muha]

(i think) you can check LANG like so (as root):

set |grep LANG

LANG=en_US.UTF-8

[ohsmitt]

I had the same problem. I fixed it by deleting the lines in
/etc/locale.gen
and removing the package locales and re-installing it

apt-get remove locales
apt-get install locales

Upon re-installing you will be asked which locales to generate. I ran into some other issues because I installed the package localepurge. Remove this if you have it, it will mess up the initial locale gen.
If you have other problems try

dpkg-reconfigure locales

[asrael]

in my case removing the locales didn't work. dependencies and so on ...
finally i somehow ended up editing

/etc/environment :
LANGUAGE="en_US:en_GB"
LANG="C"
LC_TIME="de_AT.utf8"

which leads to the following :

running "locale" as normal user
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=de_CH@euro
LANGUAGE=en_AT:en_US:en_GB:en
LC_CTYPE="de_CH@euro"
LC_NUMERIC="de_CH@euro"
LC_TIME="de_CH@euro"
LC_COLLATE="de_CH@euro"
LC_MONETARY="de_CH@euro"
LC_MESSAGES="de_CH@euro"
LC_PAPER="de_CH@euro"
LC_NAME="de_CH@euro"
LC_ADDRESS="de_CH@euro"
LC_TELEPHONE="de_CH@euro"
LC_MEASUREMENT="de_CH@euro"
LC_IDENTIFICATION="de_CH@euro"
LC_ALL=


as root :
LANG=C
LANGUAGE=en_AT:en_US:en_GB:en
LC_CTYPE="C"
LC_NUMERIC="C"
LC_TIME=de_AT.utf8
LC_COLLATE="C"
LC_MONETARY="C"
LC_MESSAGES="C"
LC_PAPER="C"
LC_NAME="C"
LC_ADDRESS="C"
LC_TELEPHONE="C"
LC_MEASUREMENT="C"
LC_IDENTIFICATION="C"
LC_ALL=

the thing is, changing the files ~/.xsession and ~/.bashrc
with things like
LANG="de_AT.utf8"
export LANG

doesn't really affect things. somehow everything just behaves strange ...
and de_CH@euro doesn't exist in the /usr/share/i18n/SUPPORTED file. no idea how i got this. but i'd like to get rid of it

[scio]

To close off this issue and for future problems:

sudo localedef -i lang-f /path/to/charmap lang

where lang is your language (en_US)
and charmap is UTF-8,
just run locate UTF-8 to find the path.